Astimulus that causes an automatic response, like the meat in pavlov's experiment with the dog, is known as

Which statement is true about the cell theory? a) it is well-supported by evidence. b) it is unchangeable and permanent.

Aphids are tiny insects that feed on plants. ladybugs are to plants because they eat aphids. which type of organism are aphids in this scenario? co decomposers predators prey producers

In what for do plants utilize nitrogen? why do they need nitrogen?