Which statement gives the best example of natural selection? a a frog has a random gene mutation that changes its color. b a lizard sits under shade in a hot desert. c a bird makes a loud call to attract a mate. d a strain of bacteria has become resistant to antibiotics.

I think it is D

Explanation:

A- That is a random gene mutation and is not natural selection

B- A lizard sitting under the shade isn't selecting anything

C- that would be sexual selection

D- bacteria becomes resistant because of natural selection.

Hope this helps :)

the answer is:

carbon dioxide

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.