Which of these is an example of electrical energy that is found in nature?
A.
lightning
B.
waves crashing
C.
the Sun
D.
a rock on a hillside

Ascientist is conducting an investigation that involves water, silver, carbon dioxide, and oxygen gas which group of statements best describes all of the materials he is using in the investigation?

Explain why biological control methods are generally environmentally superior to chemical pest control methods.

Which of the following human activities resulted in the growth of the north american deer population?