recent molecular evidence suggests that the ancestors of the aboriginal australians may have arrived on that continent much earlier than originally thought, suggesting that there may have been two waves of human migration out of africa instead of only one. what is the best next step for scientists considering this alternative explanation? (2 points) convince the scientific community the new explanation is true. look for fossil evidence that might support this explanation. assume the molecular evidence is wrong since it does not fit with what is known. determine the amount of popular support for the theory.

Answer:

Blood is not a tissue, so it should be false.

Explanation:

Protein and Acidic environment are the right options.

Digestion is that the mechanical and chemical breakdown of food into small organic fragments. it's important to interrupt down macromolecules into small fragments of suitable size for absorption by the digestive epithelium. Large, complex molecules of proteins, polysaccharides, and lipids must be reduced to simpler particles, like simple sugars, before being absorbed by digestive epithelial cells. Different organs play specific roles within the digestive process. Animal nutrition requires carbohydrates, proteins, fats, and vitamins and minerals for a diet. How each of those components is digested is described within the next section.

carbohydrate

Digestion of carbohydrates begins within the mouth. Amylase, an enzyme in saliva, begins to interrupt down dietary starch into the disaccharide maltose. Since the bolus travels through the esophagus to the stomach, no significant digestion of carbohydrates occurs. The esophagus doesn't produce digestive enzymes, but does produce mucus for lubrication. The acidic environment within the stomach stops the action of the enzyme amylase.

the following step in carbohydrate digestion takes place within the duodenum. Remember, chyme from the stomach enters the duodenum and mixes with digestive secretions from the pancreas, liver, and gallbladder. The digestive juice also contains amylase, which continues to interrupt down starch and glycogen into the disaccharide maltose. I'm here. Disaccharides are diminished into monosaccharides by an enzyme called maltase

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Even if all the cells have the same DNA they biochemical function are different, that's because differents sets of genes must be turned on and off in each cell type by the action of enzymes and other molecules. Each cell have the same 20,000 or so genes but they are biochemically selected by the action of molecules as hormones and chemical signaling. Therefore, different cells use different parts of the DNA code as directions.

The populations will come genetically homogenized if the two populations of the genetically distinct flowers begin to change settlers between the populations.

Natural selection and inheritable drift tend to enhance inheritable differences among populations; migration tends to homogenize inheritable difference, dwindling the differences among populations.. In speciation, an ancestral species splits into two or further assignee species that are genetically different from one another and can no longer interbreed. Darwin envisaged speciation as a branching event.Genetic drift is the change in frequency of a gene variant in the population due to arbitrary chance. inheritable drift may beget gene variants to vanish fully and thereby reduce inheritable variation

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If the two populations of the genetically dissimilar flowers start to exchange settlers between the populations, the populations will become genetically homogenized.

Migration tends to homogenize inheritable differences, reducing the differences between groups, but natural selection and inheritable drift tend to strengthen inheritable differences among populations. An ancestor species that can no longer interbreed separates into two or more new species that are genetically distinct from one another. According to Darwin, speciation is a branching process. Genetic drift is the shift in population frequency of a gene variant brought on by random chance. Gene variations that are caused by inheritable drift may completely disappear, reducing the amount of inheritable variation.

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Answer:

Prevertebral ganglia:)

Explanation:

Water is unique in its own way. In these characteristics, low specific heat capacity is not a defining characteristic of water.

The quantity of heat energy necessary to raise the temperature of a substance is referred to as specific heat capacity. Water can absorb or release a lot of heat with little change in temperature because it has a relatively high specific heat capacity. This characteristic enables water to regulate heat effectively and maintain a consistent temperature in a variety of environments, including bodies of water.

Thus, water does not possess low specific heat capacity as a defining property.

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The correct option is C: The concentration at which dsDNA will have the highest Tm is 100 mM.

Out of the given options, the concentration at which double-stranded DNA (dsDNA) will have the highest melting temperature (Tm) is 100 mM. Tm is the temperature at which half of the DNA strands in a double helix become denatured or separated.

It is influenced by factors such as DNA sequence, length, and ionic conditions, including the concentration of ions in the solution. In general, increasing the concentration of salt ions, such as potassium or magnesium, can stabilize the double helix and raise the Tm.

In this context, a concentration of 100 mM is likely to provide an optimal ionic environment for maintaining the stability of dsDNA, resulting in a higher Tm compared to lower or higher concentrations. It is important to note that the Tm can vary based on the specific DNA sequence and experimental conditions.

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Microfilaments can be involved in contractions that change the shape of a cell when they are associated with motor proteins such as myosin.

Microfilaments- As they are made up of two entangled strands of the globular protein know as actin, microfilaments are also known as actin filaments. They are the tiniest filament of the cytoskeleton and polymers of a protein actin. They are essential for muscle contraction, cell division, and cellular mobility.

Myosin- The molecular motor known as myosin transforms the chemical energy supplied by ATP into mechanical energy. The actin filaments are subsequently pulled along by this mechanical energy, contracting the muscle fibers and resulting in movement.

The given question is incomplete, find below the complete question,

Q. Microfilaments can be involved in contractions that change the shape of: -

a cell when they are

a. Working with microtubules to bend cilia and flagella

b. Associated with motor proteins such as myosin

c. Complexed with intermediate filaments to form desmosomes

d. Being assembled from actin monomers

e. Associated with actin-associated proteins that are adding actin monomers to the "plus end" of the filament

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Answer:

True.

Explanation:

Hope this helps!

Answer:

transportation

Explanation:

looking at nighttime satellite photos that show dark landscapes illuminated by glowing urban dots. On the surface, these seem like clear evidence of city dwellers' oversized energy footprints.

And when comparing big cities and small towns directly, a Philadelphia, Pennsylvania, obviously dwarfs the power consumption of a Philadelphia, Tennessee Urban and rural populations use energy differently, though, which complicates such broad comparisons.

Despite hosting regular traffic jams, cities win the head-to-head efficiency matchup in transportation thanks to their mass transit systems and denser layouts, which promote walking and bicycling. Small-town and suburban residents usually have to drive themselves to get around, which isn't cheap.

According to EIA data, urban U.S. households own an average of 1.8 vehicles each, compared with 2.2 for each rural household. Urban families also drive about 7,000 fewer miles annually than their rural counterparts, saving more than 400 gallons of gasoline and roughly $1,300-$1,400 at current gas prices.

( I hoped this helped! :D )

Answer:

Urban populations make use of mass transit.

Explanation:

Urban populations make use of mass transit. This cuts down drastically on the amount of money spent on gasoline and auto maintenance.

All of the following determines an ecosystem except  Solar energy.

So, option e is the right choice.

All of the options listed—amount of rainfall, mountain ranges, ocean currents, and soil type—contribute to the formation and characteristics of an ecosystem. However, the factor that does not directly determine an ecosystem is solar energy.

While solar energy is vital for sustaining life and driving ecological processes, it is not a defining factor in the creation or delineation of specific ecosystems.

Solar energy serves as the primary source of energy for most ecosystems through photosynthesis, but it does not determine the specific features, species composition, or boundaries of an ecosystem. The other factors listed—rainfall, mountain ranges, ocean currents, and soil type—have significant influences on climate, geography, and nutrient availability, which directly shape the structure and functioning of ecosystems.

The right answer is option e. Solar energy

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The absorption of ultraviolet (UV) light by DNA and RNA is important in the analysis of nucleic acids because the UV light causes the nucleic acids to fluoresce, allowing scientists to analyze the nucleic acid molecules in the sample.

By studying the wavelength of light that is emitted, scientists can determine the types of nucleotides present and how they are organized. This can be used to gain insights into gene expression, genetic mutations, and other aspects of the sample.

Ultraviolet light is absorbed by the nucleic acids due to the presence of double bonds in the nitrogenous base, which causes the bonds in the molecule to vibrate, and subsequently, the energy is lost. The amount of ultraviolet light absorbed by the DNA and RNA molecules is directly proportional to their concentration in a solution, allowing for the quantification of nucleic acids in a sample.

The ultraviolet spectrum of nucleic acids is unique in terms of its wavelength and shape, which allows for the determination of the purity and quality of DNA and RNA samples.

Any contaminants or impurities in the sample will absorb ultraviolet light in a different manner, which will result in a change in the absorption spectrum. Thus, the ultraviolet light absorption spectra can be used to identify contaminants and impurities in the nucleic acid samples.

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Answer:

23 pairs in meiosis 1 and 23 numbers in meiosis 2.

Explanation:

There are diploid number of chromosomes means double number of chromosomes at the end of meiosis 1 while on the other hand, at the end of meiosis 2, there are haploid number of chromosome means half number of chromosomes in each daughter cell. In humans meiosis 1, there are 23 pairs of chromosomes that is diploid in nature but in the end of meiosis 2, there are only 23 chromosomes in each daughter cell which is haploid in nature.

Answer:

Hey i think there is an error in ur question, u may recheck the so called word "metopus"

But here is the definition of Endosymbionts are organisms that form a symbiotic relationship with another cell or organism

Answer:

when the photo state is plant used sunlight to break apart water into hydrogen and oxygen the carbonyl the resulting hydrogen with carbon dioxide from the air to create

Explanation:

during photosynthes light energy conversion Exide and water and returns into glucose and oxygen the projects for the city is the process to use make their own food at the requins of photosynthes are carmetic exercise and water

Answer:

insulin

Explanation:

Answer:

chemical messenger.

Explanation:

Answer:

science is the study of the structure and behavior of our world and universe.

Things science cannot explain

Why ice is slippery

How many species of animals and living things there are

Explanation:

Answer:

It could be any of the following except thymine.

Answer:

energy is stored within the bonds between the phosphate groups in the ATP molecule

The source of energy stored in ATP molecules is chemical bonds between phosphate groups.

In conclusion, the source of energy stored in ATP molecules is chemical bonds between phosphate groups.

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Cholera autoinducer (CAI-1) allows the bioluminescent bacterium Vibrio harveyi to sense the presence of other Vibrio species, including Vibrio cholerae.

This is because CAI-1 is a signaling molecule that is produced by many Vibrio species and is used for quorum sensing, which enables bacteria to communicate with each other and coordinate their behavior based on cell density. Therefore, CAI-1 allows Vibrio harveyi to detect the presence of other Vibrio species and adjust its own behavior accordingly.When V. harveyi detects CAI-1, it can adjust its behavior accordingly, including regulating bioluminescence and virulence. This allows V. harveyi to communicate and coordinate with other bacterial species in their environment.

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Answer:

Pseudomonas aeruginosa is one of the common germs (micro-organisms) found in cuts or other wounds in the skin. Pseudomonas aeruginosa is a bacteria that is most commonly found in hospital settings and can be spread through infected water.

The guiding region of the sgrna is twenty nucleotides long.

The length of the most widely utilised gRNA is approximately 100 base pairs. Any genomic region that is complementary to that sequence can be targeted by the CRISPR Cas9 system by changing the 20 base pairs near the 5' end of the gRNA.

A guide sequence domain, or gRNA in our study, is intended to be present at the 5′ end of sgRNA and to be complementary to the target sequence.

CRISPR-Cas9 locates and accurately chops target protospacer DNA by following the guidance of a 20 nucleotide RNA (gRNA), 3 base pairs upstream of a PAM (Protospacer Adjacent Motif).

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The false statement regarding Gause's (1934) experiment on competition in Paramecium is:

D. When grown together, one species caused the other population to go extinct.

In Gause's experiment, the results showed that both species were able to co-exist, though one species limited its realized niche. They competed for resources, but extinction of one species did not occur.

Gause's experiment, also known as the competitive exclusion principle experiment, was conducted by the Russian biologist Georgii Gause in 1934. The experiment aimed to study the dynamics of competition between two closely related species of Paramecium, P. aurelia and P. caudatum.

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Answer:

      Physical properties that contribute to the change in sea level rising are -

  Explanation:  All these three physical properties contribute to sea level rising.

Hence, these three physical properties contribute to the change in sea level rising.

Answer:

B. the rate of forward reaction increases .

Answer:

so the answer is peer review

Explanation:

Yes, other scientists are participating in this activity not in a direct way but in an indirect way. The scientists are participating in peer review.

The scientific paper was written by scientists which provide the data and conclusion of entire experiments. To write scientific experiments we need to collect data, frame hypotheses, research methodology, and find out the conclusion are some of the steps to writing a scientific paper.

Testing hypotheses often involves designing experiments. In the given experiment Dr. Sanchez found that star is consumed by a nearby blackhole. But other scientist found the unusual star as well.

This suggests that both scientist thought on different aspect. This suggest peer review.

Therefore, Yes, other scientists are participating in this activity not in a direct way but in an indirect way.

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Explanation:

a fine powdery substance, typically yellow, consisting of microscopic grains discharged from the male part of a flower or from a male cone. Each grain contains a male gamete that can fertilize the female ovule, to which pollen is transported by the wind, insects, or other animals. This is called pollen .