Species X and Y have very similar proteins and DNA. Species X and Z have very different proteins and DNA. What is more likely true about these three species?
a. Species X is older than either Species Y or Z
b. Species X is younger than either Species Y or Z
c. Species X and Y share a more recent common ancestor than species X and Z.
d. Species Y and Z are more closely related than species X and Z.

Which of the following best describes the purpose of the parathyroid hormone? a. it decreases the blood calcium level and decreases blood phosphorus level. b. it decreases the blood calcium level and increases the blood phosphorus level. c. it increases the blood calcium level and increases blood phosphorus level. d. it increases the blood calcium level and decreases blood phosphorus level.

1. -define adaptation2 explain darwin's theories of descent with modification and natural selection in detail3. -explain how each of these provides evidence for evolution: a. -fossil record, including superposition and transitional fossilsb-anatomy, including homologous structuresc-biological molecules, including dna and proteins4. -explain the difference between convergent and divergent evolution.5. -define and give three examples of artificial selection6. -define and give one example of coevolution.7. -explain biodiversity and how it benefits humans.8. -explain a type of population lest affected by environmental change.

Which fossil organism in whale evolution do you think was the first to live mostly in water? explain your claim with evidence and reasoning?