HELP plz For Biology = Which of the two largest cavities forms earliest in fetal development? Why do you think that cavity, and its contents, develops before other body parts?

Surrounded by microtubules, located near the nucleus. (don't try to google it) (give answer only if u know)

What would most likely happen if a person increased the amount of saturated fat in his or her diet? the person's risk of cardiovascular disease would increase. the person's risk of cardiovascular disease would decrease. the person's bad cholesterol would decrease. the person’s good cholesterol would increase.

The distant ancestors of tigers may have had bodies without stripes. use the theory of natural selection to explain how tigers may have evolved to have stripes.