Evolution Evolution HELP! please?

Question

In Yellowstone national park, some species of algae and bacteria can survive and reproduce in hot springs at temperature near the boiling point of water. The ability to survive and reproduce at these temperatures is an example of

1.) aggregate formation

2.) artificial selection

3.) adaptation

4.) reproductive isolation

and

In his theory of evolution Charles Darwin was not able to Explain

1.) competition

2.) overproduction

3.) reproduction

4.) variation

IN the early stages of development the embryos of birds and reptiles resemble each other in many ways. THis resemblance suggests that they

1.) belong to the same species

2.) share a common ancestry

3.) are adapted for life in the same habitat

4.) are both animal like protists

Answer 1

3.)

I'm unsure, possibly 4.) Darwin was unable to work out the mechanism of inheritance

2.)