The basic filtration unit of the kidneys is the nephron.
a. true
b. false

Use the drop down menus to match each example to the fossil topic discussed then to show how the fossil record gives evidence of evolution

All individuals have two alleles for a given trait. according to mendel's these alleles are passed down one each from both mother and father.

The finches on the galapagos island were similar in form except for variations of their beaks. darwin observed that these variations were useful for: attracting a mate defending territory building nests gathering food