In order for pepsin to be active and efficient, what must be true? The solution (liquid) must be acidic around 2 pH.

The temperature must be over 98 deg F.

The solution (liquid) must be basic around 11 pH.

The temperature must be under 98 def F.

Which of the following is not a classification of marine organisms? a. benthos c. neritic b. nekton d. plankton select the best answer from the choices provided a b c d i know the answer is not option b

Cedric has a low fever and minor aches. yesterday, he went to the doctor for his booster shot and receive the flu shot. which best explains why he has this reaction?

The large increase in atmospheric carbon dioxide in the last 50 years most likely comes from a. an increase in cellular respiration b. increased decomposition by bacteria c. an increase in the burning of fossil fuels d. an increase in photosynthesis