Question

Which of the following statements about algal blooms is true?
A. Algal blooms are caused by fish
B. Algal blooms can only happen naturally
C. Algal blooms are always human caused
D. Algal blooms are sometimes caused by natural occurrence and sometimes the result of human activities

Answer 1

Answer:

These blooms occur when phytoplankton, which are tiny microscopic plants, grow quickly in large quantities while producing toxic or harmful effects on people, fish, shellfish, marine mammals, and birds

Explanation:

Answer 2

The following statements about algal blooms is true is  Algal blooms are sometimes caused by natural occurrence and sometimes the result of human activities.

What causes algal bloom?

Algae blooms can occur when a variety of suitable environmental conditions exist for Large algal growth.

Thus, option "D" is correct.

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