Which characteristic of life best describes the life cycle of a frog?
a)having cells
b)using energy
c)responding to the environment
d)growing and developing

I believe that the correct answer is D. growing and developing. This should be the option that best describes the life cycle of a frog. In its evolution, a frog is first a tadpole, and then it develops and grows until it becomes a full-grown frog. So, yes, it does use energy, responds to the environment, and has cells, but those options aren't the most important ones when it comes to a frog's life cycle.