Fluctuations in the phosphorus cycle in aquatic ecosystems
a. can lead to changes in the growth rates of aquatic populations
b. are never caused by human impact on the environment
c. lead to a decrease in the amount of phosphorus found in sediment
d. never occur naturally

Fluctuations in the phosphorus cycle in aquatic ecosystems

a. can lead to changes in the growth rates of aquatic populations

Explanation:

The rise in phosphorus quantity within the aquatic scheme can increase the quantity of protoctist among that scheme. Once the quantity of protoctist is raised, the aquatic organisms can have loads of food supply which is able to increase the expansion rate among their population.

enzyme active site and substrate specificity

enzymes bind with chemical reactants called substrates. there may be one or more substrates for each type of enzyme, depending on the particular chemical reaction. in some reactions, a single-reactant substrate is broken down into multiple products