Speciation within in a clade is an example of what?

How did the miller-urey experiment impact the way scientists think about the origins of life? use what you know about the miller-urey experiments to discuss the factors needed for life to arise, and speculate on whether life could arise on another planet.

The kind of fertilization found in the majority of aquatic animals is (internal or external) fertilization.

Plz ! ive been stuck on this forever