What does the earth food chain start with

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

Plz ! ive been stuck on this forever

One important development during the 3rd trimester that will insulate the infant against changes in temperature is a. the deposition of fat under the skin b. the closing of the septum between c. the atria of the heart d. the beginnings of lung functioning e. the beginnings of light and sound sensing