Flowering plants appeared
A.)Paleozoic
B.)Cenozoic
C.)Mesozoic

Answer:

How are macromolecules involved in passing traits from parents to offspring? DNA involved in passing the characters from one generation to the next generation. DNA is genetic material. It codes mRNA, which translates in the form of long chains of proteins. Proteins are natural bio-catalyst.

Explanation:

Allosteric effectors are the molecules that can bind to the allosteric site of an enzyme, a non-active site and modulate its activity. It can either inhibit or activate the enzyme, therefore regulating the metabolic pathway involved in the synthesis or degradation of specific molecules.

The activity of the allosteric effector is concentration-dependent, and it varies according to the concentration of substrate present. A group of answer choices inactivates the enzyme at high concentrations of substrate. On the other hand, some groups of answer choices increase the sensitivity of the enzyme at low concentrations of substrate. While some groups of answer choices decrease the sensitivity of the enzyme at nearly all concentrations of substrate.

The allosteric effectors, by binding to the non-active site of an enzyme, can alter the conformation of the enzyme's active site, hence changing the substrate binding affinity. A non-competitive inhibitor is an example of an allosteric effector that can decrease the sensitivity of the enzyme at nearly all concentrations of substrate. The non-competitive inhibitor can bind to the allosteric site of the enzyme and cause a conformational change that inhibits the binding of substrate to the active site.
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The association between cerebral blood flow, brain tissue relaxation time, and neurodevelopmental outcomes of preterm neonates is an area of research aimed at understanding the relationship between brain perfusion, tissue characteristics, and long-term neurological outcomes.

Here's an overview of the topic:

Preterm Neonates and Neurodevelopmental Outcomes: Preterm neonates, born before 37 weeks of gestation, are at an increased risk of neurodevelopmental problems compared to full-term infants. These problems can include cognitive, motor, and behavioral impairments that may persist into childhood and beyond.

Cerebral Blood Flow: Cerebral blood flow (CBF) refers to the blood supply to the brain and plays a vital role in delivering oxygen and nutrients to brain tissues. Altered CBF in preterm neonates can impact brain development and function.

Brain Tissue Relaxation Time: Brain tissue relaxation time, often measured using magnetic resonance imaging (MRI) techniques, provides information about the physical properties of brain tissue. It can reflect factors such as tissue composition, water content, and microstructural characteristics.

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Answer:

A

Explanation:

independent variable is the one variable changed and tested

Answer:

Hypothesis is ''With the increase of algae in the aquarium, fish population decreases''.

Explanation:

The main problem was that there is no need for 2 aquarium because there is no need for aquarium 1 which has no fish and aquarium 2 which has fishes but no algae. With the increase of algae in the aquarium, fish population decreases is the hypothesis for this experiment. Concentration of algae is the independent variable of the experiment because there is no effect on it in the experiment.

Fight-or-flight response refers to an organism's response when faced with an acute threat to survival. It is marked with physical changes that include nervous and endocrine changes preparing the organism to react or to retreat.

For example, when a snake faces a predator or a threat, its responses could be crawling away or acting as if it is ready to attack as its defensive displays. It could be through hooding, hissing, and raising the upper portion of their bodies to stand erect.

Answer:

Stable Environment

Explanation:

Mark could possibly be suffering from Ischemic Heart Disease.

A persistent medical disease called hypertension, often known as high blood pressure, causes the condition in which the blood to be greater than it should be. The heart must work harder than usual to pump more blood through all the blood arteries in this situation.

Based upon what the heart is doing, the pressure within the arteries varies. The pressure rises as the heart pumps blood through the arteries by contracting. The pressure drops when the heart unwinds. Systolic blood pressure is the maximum pressure recorded during a blood pressure reading. Diastolic blood pressure is the lowest pressure.

Two numbers are used to represent blood pressure. For instance, the human's systolic blood pressure in the image to the right was 158. They had a 99 systolic blood pressure reading.

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Answer:

they adapted to their environment, some have sharper beaks which are used to crack nuts, when they were introduced to the new environment they evolve to the new surroundings in order to survive. therefore, seeing as though there is 13 different species, the Galapagos islands have many different food sources, and ecosystems.  

Explanation:

The population of frogs in a pond grows exponentially, tripling every 6 days. Initially, there are 28 frogs.

Time to 260 frogs:

A = P(1 + r/n)^(nt)

260 = 28(1 + 3/1)^(6t)

9.2857 = 4^(6t)

(6t) log 4 = log 9.285

t = log 9.2857 / log 4

2.378 days to reach 260 frogs.

Time to 1300 frogs:

A = P(1 + r/n)^(nt)

1300 = 28(1 + 3/1)^(6t)

46.4286 = 4^(6t)

(6t) log 4 = log 46.4286

t = log 46.4286 / log 4

6.027 days until the pond's ecosystem can support 1300 frogs.

Therefore, it will take around 2.378 days to reach 260 frogs and approximately 6.027 days until the situation becomes critical when the pond's ecosystem can support 1300 frogs.

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The impact of drug addiction on emotional and physical spheres​ include the following respectively:

This involves the excessive use of drugs which results in creating pleasurable effects on the brain. This usually leads to addiction and destroys vital cells of the body such as that of the liver, lungs etc.

Drug abuse leads to the damage of parts of the brain which is the reason why it affects an individual emotionally and also physically as the brain is involved in controlling most of the processes in the body.

These are therefore the different ways in which drug addiction has an impact on emotional and physical spheres​.

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Answer:B

Explanation:

Answer:

C.the arrows would point in a variety of directions

Answer:

strike-slip is when the blocks have mostly moved horizontally, normal is when a dip-slip fault in which the block above the fault has moved downward relative to the block below, and thrust is when the hanging wall moves up relative to the footwall.

There are three faults. Normal faults originate from the divergent boundary. Reverse faults originate from the convergent boundary. Strike-slip fault originate from transforming boundary.

We can differenciate three types of faults,

I. Divergent:

This boundary occurs when two plates separate and molten material rises from the mantle creating a new crust.

The hot material creates a new seabed between the separating plates, expanding the sea bottom.

II. Convergent.

Collision area between two plates. Two oceanic plates might collide, or one oceanic plate with a continental one.

In this last case, the oceanic crust sinks under the continental plate, and magma rises to the surface by crevices.

The thicker and older plate subduces under the other plate.

III. Transforming.

The plates slide laterally with each other, and they are usually called faults.

It is associated, in general, with the oceanic ridge, although it might also occur in the continental plate.

No rocky material is either destroyed or formed.

When the plates move and produce a displacement of one transforming limits from side to side, earthquakes occur.

The movement breaks the crust and originates pronounced fractures.

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Answer:

Mesozoic Era

Explanation:

The "Mesozoic Era" is divided into three periods: Triassic, Jurassic and Cretaceous. During the last period (Cretaceous), which was considered the longest, the extinction of reptiles occurred and the new mammals appeared. This event was also known as the "Cretaceous-Paleogene Extinction Event." Around 3/4 of plants and animals died. Such event became significant boundary that laid between the Cenozoic Era and the Mesozoic Era. This made it significant in geologic history.

Explanation:

When fossil fuels are burned, they release carbon dioxide and other greenhouse gases, which in turn trap heat in our atmosphere, making them the primary contributors to global warming and climate change.

Answer:

The burning of fossil fuels releases carbon dioxide and other greenhouse gases.

Explanation:

Greenhouse gasses can cause climate change by trapping heat, and also contribute to respiratory disease from smog and air pollution.

Answer:

C

Explanation:

Biofilms preferentially form in moists environments with high levels of

nutrients.

These comprises of one or more types of microorganisms which grow on

different types of surfaces.

The surface which favors the growth of these microbes are usually very

moist with high nutrients which they feed on for their growth and survival.

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Answer:

0.7

Explanation:

Given that in statistics, the Relative Frequency is the Frequency of the class divided by Total.

Hence, in this case, the Relative Frequency of black hair is the Frequency of black hair divided by the Total.

Hence, we have 70 ÷ 100

=> 0.7

Therefore, the correct answer is 0.7 Relative frequency.

Lamarckian and Darwinian ideas about evolution differ in their explanations for how species change over time. Lamarckism proposes that acquired characteristics can be inherited, while Darwinism emphasizes natural selection and variation as driving forces of evolution.

Lamarckian and Darwinian ideas about evolution have fundamental differences in their explanations:

Lamarckism, proposed by Jean-Baptiste Lamarck, suggests that acquired characteristics during an organism's lifetime can be passed on to the next generation. Lamarck argued that organisms change in response to their environment and these changes are then inherited. For example, if a giraffe stretched its neck to reach higher leaves, its offspring would inherit a longer neck.

On the other hand, Darwinism, formulated by Charles Darwin, centers around natural selection and variation. Darwin proposed that organisms with favorable traits are more likely to survive and reproduce, passing those advantageous traits to subsequent generations. This process, known as "survival of the fittest," leads to the gradual accumulation of beneficial traits in a population over time.

The key differences between Lamarckism and Darwinism are:

1. Inheritance of acquired characteristics: Lamarckism suggests it is possible, while Darwinism rejects this idea.

2. Mechanism of change: Lamarckism proposes that organisms change in response to the environment, while Darwinism emphasizes natural selection acting on variations already present in a population.

3. Timescale: Lamarckism implies rapid and continuous change, while Darwinism allows for gradual and cumulative changes over long periods of time.

In summary, Lamarckian evolution focuses on the inheritance of acquired characteristics, while Darwinian evolution emphasizes natural selection and the accumulation of beneficial variations over time. Darwin's theory of evolution by natural selection is widely accepted and forms the basis of modern evolutionary biology.

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Answer:

phospholipids

Explanation:

The fundamental building blocks of all cell membranes are phospholipids which are amphipathic molecules, consisting of two hydrophobic fatty acid chains linked to a phosphate-containing hydrophilic head group.

Answer:

Desert biome will change.

Explanation:

Desert biome will change if the area received more rain than normal it receives over an long period of time because the vegetation on that area appears. The change in rainfall pattern in the desert area changes the animals present in this region because the temperature of the desert is no longer suitable for the desert animals so they migrated and other organisms come to this place.

The number of possible connections among the neurons of the brain is about 500 trillion (B).

Neurons are specialized cells that process and transmit information in the brain. Each neuron is connected to other neurons through synapses, which are the sites of communication between neurons. The number of possible connections between neurons in the brain is incredibly large.

According to estimates, the human brain has about 100 billion neurons, and each neuron can form connections with up to 10,000 other neurons. This means that the total number of possible connections in the brain is about 1 quadrillion (10^15).

However, not all possible connections are formed in the brain, and the actual number of connections is estimated to be around 150 trillion (10^14). Therefore, the correct answer to the question is an option (B) about 500 trillion.

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Answer:

water, sugars, oxygen

Explanation:

Water, carbohydrates, and oxygen Green plants and some other organisms use sunlight to create food from carbon dioxide and water. The green pigment chlorophyll is most commonly used in photosynthesis in plants, which produces oxygen as a byproduct.

Transfer of Atoms.

The three primary types of photosynthesis are ATP production (C3, C4, and CAM) (crassulacean acid metabolism).

Carbon fixation.

The significance of photosynthesis - It is the primary source of all human food.

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Answer:

B

Explanation:

Prokaryotic cells lack a nucleus

The Andromeda galaxy is bigger than Milky Way galaxy.

The main difference between Andromeda galaxy and the Milky Way galaxy is their sizes. The Andromeda galaxy is bigger than Milky Way galaxy because the Andromeda galaxy comprises of about a trillion stars while on he other hand, the Milky Way contains about 300 billion stars. The Milky Way and the Andromeda galaxy are also similar to each other in their shape which are giant spiral galaxies.

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To answer your question, it's .A: They both exert a strong gravitational put on each other.

I hope this helps you!

Answer:

elecrons and protons

Explanation:

simple pro