The overgrowth of algae on the surface of this water is caused by

A) a decrease in the oxygen levels in the water

B) not enough primary consumers in the ecosystem

C) an increase in nitrogen levels in the water from fertilizer runoff

D) an excess of carbon dioxide in the water due to an increase in the number of fish

Some algal blooms are the result of an excess of nutrients (particularly phosphorus and nitrogen) into waters and higher concentrations of these nutrients in water cause increased growth of algae and green plants. As more algae and plants grow, others die.

Explanation:

amber has allowed scientists to study dna that has been preserved over millions of years.

it's     c       this is a cell (b) with a nucleus (c) containing dna (a). the dna is organized into chromosomes (d). a section of the chromosome that codes for a trait is called a gene (e).