Which is the last structure to contact sperm before it leaves the body?

I’m doing some practice exam questions for biology, and i’m not sure how to do these 3 parts to the question.

According to theories of how life began, how did early organic molecules begin to separate from the outside world? a: specialized enzymes were required b: chains of amino acids created a barrier c: formation of microspheres or vesicles d: rna catalyzed the formation of membranes

As an asteroid comes close to earth, it's name will change to? apex