Question

How can algal blooms be

harmful to an aquatic
environment?

A. by blocking all sunlight and killing the bottom plants
causing no oxygen to go into the water

B. by putting oxygen up into the air for the
surrounding plants

C. by absorbing the phosphorus in the atmosphere and
having a symbiotic relationship with cyanobacteria

Answer 1

(A) By blocking all sunlight and killing the bottom plants

causing no oxygen to go into the water