Which of the following is true about natural selection?

Biology

1 answer:

tester [92]3 years ago

4 0

Natural selection acts on existing heritable variation

Answer: Option C

Explanation:

Natural selection is a process that occurs in nature as a key to evolution. It also goes hand with the survival of the fittest. Nature always selects the best trait to survive or get accustomed to the surrounding by undergoing modifications.

It acts on the genotype of the existing generation and causes variation in the future generation. So the population over generations get to have acquired the variations in their body, structure so that it is adaptable to the surrounding.

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What makes a fossil an index fossil ?

Masja [62]

Answer:

An index fossil is a fossil used to determine the age of the sediments in which it is found. When quickly approximating the age of new finds, an archaeologist looks at the rocks in which it is buried, as those sediments would have been on the surface at the time of the death of the pre-historic creature.

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2 years ago

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The speed of neurotransmission in the frontal lobe increases during adolescence due to the growth of

Marizza181 [45]

Answer: Myelin

Explanation:

The speed of the neurotransmission increases as we grow. The behavior of the teenager is quite different from the behavior of the adolescents.

They are more active, heroic and wants to take risk. This is because their brains are not completely developed till they reach the age of 25.

As they grow and reach the late 20s the white mater in the brain increases as the frontal lobe is the last part of the brain development.

Due to the development of the myelin in the frontal lobe the transmission of the signal increases at adolescence.