The activity for Enzyme A and Enzyme B are displayed on the graph below. Enzyme A is found in thestomach and Enzyme B is found in the intestinal tract of some animals. What is the probable pH of the stomach?
F. 1
G. 2
H. 3
J. 4

Which of the following occurs most often in a population when genetic variation and overproduction are present? some organisms have a lower reproductive success than others. some organisms have a higher reproductive success than others. some organisms have no reproductive success. some organisms do not have genetic variation.

In this case, the statement that people who exercise for an hour may have lower cholesterol levels is .

Which direction does the energy flow in this energy pyramid ?