Q: Fact: alternative fuel is usually a renewable resource
Question: One renewable fuel source is

A: vegetable oil

Q: Fact: heat and pressure change the remains of prehistoric living things into natural gas
Question: heat and pressure change the remains of what into natural gas?

A: leaves

Q: Fact: insects can have a negative impact on crops
Question: Locusts historically always affect crops

A: disadvantageously

Q: Fact: as the supply of food in an environment decreases , the population of animals in that environment will decrease
Question: A squirrel eats all of the acorns in a tree. The tree is empty, and the squirrel is still hungry, so

A:
the squirrel leaves