. When are lipids (fat molecules) broken down into smaller molecules by your body?
when you are participating in intense exercise and need quick energy
during digestion and after you have used all of your quick energy
while you are at rest and your body has time to store energy

The body uses these basic units to build substances it needs for growth, ... They are small molecules, so they can be broken down and absorbed by the body C IS THE ANSWER

Explanation:

the oldest known insects are believed to live around 400 millions ago as suggested by the fossil records.   some plants having woody stems also evolved during this time.

after the evolution of insects the first four legged species or the tetrapods evolved in shallow freshwater habitats from the intermediate species approximately 397 million years ago. the tetrapods went on conquering the land giving rise to amphibians, reptiles, mammals and birds.

the major split in tetrapods first occurred 340 million years ago branching off from amphibians.

363 million years ago when the carboniferous period began the insects started roaming on land and taking flights, following which the four limbed tetrapods adapted in the terrestrial habitat.