sodium.
Most cell membranes have a sodium-potassium pump. It is an enzyme that pumps sodium ions out of the cell and potassium ions into the cell. It moves 3 sodium ions out and 2 potassium ions in. Both ions are transported against the concentration gradient. Thus, the sodium-potassium pump provides one positive charge carrier to the extracellular space.
Answer:
The answer is A. a natural disaster killed off the population by flooding their habitat.
Explanation:
I had to do the assignment.
The zooplankton community is an important element of the aquatic food chain. These organisms serve as an intermediary species in the food chain, transferring energy from planktonic algae (primary producers) to the larger invertebrate predators and fish who in turn feed on them.
Zooplankton are good indicators of change in nutrient pollution over time because they respond quickly to changes in nutrient input to the waterbody.