Which statement supports the theory of evolution by natural selection?
A. Organisms change when the survival rate of
offspring begins to decrease.
B. Mutations occur in species that are not suited
for their environment.
C. Evolution is the result of mass extinctions of
species in different ecosystems due to a lack
of genetic diversity
D. Characteristics of populations can change over
time in response to environmental changes.
8.

Choice D

Explanation: Natural selection explains how the strong survive due to mutations to suit the environment.

1. amino acid refers to the fundamental building block of proteins, comprising of an amino group and a carboxyl group.

2. catalyst refers to any substance, which increases the rate of chemical reaction without being used up in the reaction.

3. a complex molecule containing he genetic code is dna or deoxyribonucleic acid.

4. an enzyme refers to a molecule of protein, which is unique in accelerating up a particular chemical reaction in the biological systems.

5. nucleic acid refers to an sequence of sugars, phosphates, and nitrogenous bases, for example, dna and rna.

6. a protein refers to a large, composite organic molecule comprising of a huge number of amino acids associated together with the of peptide bonds.

7. rna refers to a nucleic acid that takes part in the production of proteins.

8. substrate refers to a compound, which takes part in a chemical reaction, and is chemically modified by the reaction.