Why can algae and cyanobacteria be considered indicators of productivity as well as of pollution

They can be both positive and negative to the environment.

Explanation:

Algae and cyanobacteria are used both in industrialized process of biotechnology and the cyanobacteria in a certain degree can help the algae flourish, upto a certan concentration, once we are past that point the cyanobacteria is considered pollution and wont help the algae reproduce anymore.

answer; i do believe that the correct answer is; ///mendelian genes are at specific loci on the chromosome and, in turn, segregate during meiosis;

d

explanation: