What makes up cell membranes and is used to create hormones. A. cholesterol
B. hydrocarbon
C. starch
D. glucose

Which direction does the energy flow in this energy pyramid ?

Ascience research group is testing a new type of plant food. one trial is conducted in a controlled experiment. the data from the trial show that the plant that received the new food grew faster than the control plant. the group announces that the new plant food makes plants grow faster. what is the main weakness in this scientific claim?

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