.

C

Explanation:

The big line on the right is just a really common common ancestor, the bits that go left just became separate from the ancestor, so the other lines going left have become pretty different species, Arabidopsos is the endpoint, meaning that the right line is just directly where it came from, and the other lines came from what it came from as well, just at different points in time, in this case Cydad broke off at the most recent point, making it the closest relative

the index of refraction of the second medium is higher. i just took the test trust me !

1. is geographic distribution

2 is increasing complexity

3 is transitional forms