When crustaceans such as crabs are kept in seawater with a lower-than-normal pHpH, ATPATP-requiring pumps that maintain ion gradients in the animals' bodies significantly increase their activity in comparison with normal levels. Explain how the increased use of ATPATP by these pumps will most likely affect the ability of the animals to carry out other metabolic reactions such as that catalyzed by PFK

answer: - few nutrients

high pressure

low temperatures

explanation: 1. few nutrients:   open-ocean zone is located way far from the land, which is the main source of the essential nutrients.2. high pressure: pressure increases by 1 atmosphere for every 10 meters increase in depth.3. ample sunlight: a large fraction of the sunlight is reflected back to the atmosphere from the sea surface. 4. varying salinity: below the thermocline, the water is isolated from the atmosphere so the salinity remains stable over the year.5. low temperatures:   the temperature of open-ocean zone ranges from a low of -2°c to an average of 17°c

the answer is c on e2020, bud.

the endomembrane system i think