The last common ancestor of all bilaterians is thought to have had four Hox genes. Most extant cnidarians have two Hox genes, though some have three Hox genes. On the basis of these observations, some have proposed that the ancestral cnidarian's were originally bilateral and, in stages, lost Hox genes from their genomes. If true, this would mean that .
A) all radially symmetric animals should be grouped together in one clade
B) the radial symmetry of extant cnidarians is secondarily derived, rather than being an ancestral trait
C) Hox genes play little actual role in coding for an animal's "body plan"
D) cnidaria may someday replace porifera as the basal bilaterians

The G1 phase of each nucleus' 12 picograms of DNA will be followed by a 24 picogram G2 phase.

If a cell enters the G1 phase of mitosis with 15 picograms of DNA and 14 chromosomes, it will have 28 chromosomes and 30 picograms of DNA by the time it enters the G2 phase.

The number of haploid (n) chromosomes in the gametes, or reproductive cells of sperm and ova, would be 23. The organism in this case has an organism with a diploid (2n) number of 12 and a haploid (n) number of half that, or 6 chromosomes.

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The most porous object out of the given options is a. sponge.

Hence, the sponge is the most porous object.

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Answer: Your answer would be "Sodium gives an electron to chlorine"

Explanation: A proton gives a positive charge while an electron gives a negative charge, the only reason why it is that answer is that sharing a proton won't change its positivity, giving out a proton will make sodium more negative, and taking in a valence electron does not affect positive or negative aspects of sodium. Therefore, your answer is "Sodium gives an electron to chlorine" (Much appreciated if you give brainliest)

Answer:

Mammals

Explanation:

This is because the sperm meets the egg and fertilizes it in a female mammals which occurs in the ovary

Saccharomyces cerevisiae is an economically important microorganism because it ferments sugars to produce a CO₂ and ethanol. Option B and F is correct.

Saccharomyces cerevisiae is a type of yeast which  is widely used in the various industries, including food as well as beverage, biofuel, and pharmaceuticals, due to its ability to ferment sugars.

One of the primary products of Saccharomyces cerevisiae fermentation is ethanol, which is an important biofuel and a key component in the production of the alcoholic beverages.

During fermentation, Saccharomyces cerevisiae also produces a carbon dioxide (CO₂ ) as a byproduct, which is utilized in various applications, such as in bread-making as well as carbonation in beverages.

Hence, B. F. is the correct option.

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At the conclusion of meiosis, there are four haploid daughter cells that go on to develop into either sperm or egg cells.

Answer:

The cell feature that is responsible for making proteins are the ribosomes.

Answer:

I'm not sure what the ecosystem is, but it makes sense for the answer to be C or B (just depends if there's anything preying on the bass).

Answer:

A is the correct answer because snails are first level consumers and this also means there is more energy by eating the snails.

Explanation:

Answer: Mass flow or bulk flow is the movment of substance in big masses or something moving in a big group.

Explanation:

Its kind of like a river or blood flowing through your veins because its a mass of a substance moving in a group.

The length of the bone shows that the body has been dead about four years. Option B

We know that the skeleton is the part of a person that remains after the individual has died. It is composed of the bones of the deceased. The length of the bone is a determinant of the length of time within which the person died.

This is because, the changes in the length of the bone gives insight into the degeneration of the bone cells which follows the death of the human.

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This is an example of natural selection shaping the sea otter population in response to an environmental change caused by an oil spill.

Natural selection is a fundamental concept in evolutionary biology. It refers to the process by which certain traits become more or less common in a population over time, based on their impact on survival and reproduction. In this case, the oil spill along the northern coast of Alaska had a significant impact on the sea otter population.

Initially, the sea otter population consisted of individuals with varying levels of cold water tolerance. Some otters were able to thrive in the colder waters farther north, while others preferred the central coastal area. However, the oil spill caused a large number of otters living in the colder waters to die. This event created a strong selective pressure on the population.

As a result, the surviving otters were primarily those with a higher tolerance for the central coastal area, where the water is relatively warmer. The otters with a lower tolerance for cold water were less likely to survive and pass on their genes to the next generation. Over time, this led to a shift in the overall population's tolerance for cold water, with a higher proportion of otters adapted to the warmer central coastal area.

This example demonstrates how environmental changes can influence the distribution of traits within a population through natural selection. It highlights the role of selective pressures in shaping the characteristics of a species over generations.

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Answer:

Resting membrane potential

Answer:

Explanation:

is BA force must be applied pushing the car forward in the same direction as the moving car.

Observation is the only option that is not a variable in scientific experiment.

Variables are factors, or condition that can exist in differing amounts during a scientific experiment.

Scientific experiment usually has three kinds of variables:

Thus, Observation is the only option that is not a variable in scientific experiment.

The complete question is below:

Which of the following is not a type of variable in a scientific experiment? A. Independent B. Control C. Dependent D. Observation

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Answer:

Its A

Explanation:

brainliest please if its right

Answer:

Students identify that atoms are not conserved in nuclear fusion, but the total number of protons plus neutrons is conserved. ... Helium and a small amount of other light nuclei (i.e., up to lithium) were formed from high-energy collisions starting from protons and neutrons in the early universe before any stars existed.

When bilirubin levels rise, it can be harmful and lead to issues such as liver damage or illness, particularly in infants.

Many babies have naturally and temporarily high bilirubin levels in their blood. High bilirubin levels in adults may suggest gallstones, a liver problem, or another illness. High bilirubin levels are frequently accompanied by jaundice. In your blood, bilirubin is a yellowish substance. It is formed when red blood cells degrade and then passes through your liver, gallbladder, and digestive tract before being expelled.

Hyperbilirubinemia is a condition characterised by elevated bilirubin levels. It's generally an indication of an underlying problem, therefore it's critical to see a doctor if your bilirubin levels are high. It is also a frequent short-term issue in babies.

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Answer:

egg and sperm join, zygote froms , meiosis produces sex cells , new organism develops

The population projection technique that allocates a projected population expansion to subregional areas is called shift share approach.

What is population?

A community's inhabitants who belong to the same species. A population's makeup is influenced by things like density, sex ratios, birth and death rates, immigration, and emigration.

What is sub region?

A biogeographic region's major division. subregional.

Therefore, the population projection technique that allocates a projected population expansion to subregional areas is called shift share approach.

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Answer:

Light rain, warmer weather, and clouds

Answer:

-heat

Explanation:

Radiation happens when heat moves as energy waves, called infrared waves, directly from its source to something else. This is how the heat from the Sun gets to Earth. In fact, all hot things radiate heat to cooler things. When the heat waves hits the cooler thing, they make the molecules of the cooler object speed up.

Good luck!!

Answer:

Explanation:

Radiation is a method of heat transfer that does not rely upon any contact between the heat source and the heated object as is the case with conduction and convection. Heat can be transmitted through empty space by thermal radiation often called infrared radiation. This is a type electromagnetic radiation .

Answer:

I believe that the answer would be skin abnormalities.

Explanation:

Growths do not apply.

Melanin applies mainly to freckles.

Answer:

law of segregation states that each gamete carries Separate allele for each gene

Answer:

law of segregation

industrial preparation of oxygen from liquify air

Answer:

1.) Dependent variable is weight

Independent variable is growth hormones.

2.) Independent variable is mosquito repellent

Dependent variable is number of bites

3.)Dependent is water

Independent is mass

4.) Indepent is the whole scenario

Dependent is the speed and how it affects the cars.

5.) Independent is the wet or dry enviroment

Dependent is the time spent

Explanation:

Dependent variable is weight and Independent variable is growth hormones.2.) Independent variable is mosquito repellent and Dependent variable is number of bites.

The dependent variable is the variable that is being measured or tested. For example, in a study looking at how tutoring impacts test scores, the dependent variable would be the participants' test scores since that is what is being measured.

This is different than the independent variable in an experiment, which is a variable that stands on its own. The independent variable (tutoring) doesn't change based on other variables, but the dependent variable (test scores) may.

One way to help identify the dependent variable is to remember that it depends on the independent variable. When researchers make changes to the independent variable, they then measure any resulting changes to the dependent variable.

Therefore, Dependent variable is weight and Independent variable is growth hormones.2.) Independent variable is mosquito repellent and Dependent variable is number of bites.

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The Hardy-Weinberg equation is used to calculate the relationship between allele and genotype frequencies of a given population.

It provides a mathematical framework for understanding how genetic variation is maintained in a population over time, assuming certain conditions are met. The equation relates the frequencies of alleles (alternative forms of a gene) to the frequencies of genotypes (the combination of alleles in an individual). By comparing observed genotype frequencies with those expected under the Hardy-Weinberg equilibrium, deviations can be detected, indicating factors such as natural selection, genetic drift, migration, or mutation that may be influencing the genetic makeup of the population.

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