Scientists have collected millions of fossils of different organisms, and have developed a timeline of life on Earth. What do we call this?

An example of a physical adaptation is...

Some female peacocks prefer males with large, colorful tales while other female peacocks prefer males with no tail at all. Females are beginning to only mate with the type of males with the tail they prefer. What type of reproductive barrier is this? (Example in your notes involves birds mating songs.)

serve no function but resemble structures with functional roles in related organisms

Two organisms that are closely related would have

What do you call the study of embryonic development between many organisms and how similarities must indicate common ancestry?

_________________ is an evolutionary tree is a branching diagram or "tree" showing the inferred evolutionary relationships among various biological species or other entities.