Colonies of cyanobacteria benefit aquatic organisms because they can be an important source of food to organisms.
The problem with cyanobacteria is that they can be harmful and in an alga bloom then can cover the surface cutting off any light to other plants and producing toxins that kill fish and other life forms.
Answer:
Tundra
Explanation:
Permafrost is a layer just beneath the surface of the ground that never thaws.
A contaminant is any environmental agent -biological,chemical or physical that causes damage.
The correct answer is:
Nucleus
Prokaryotic cells do not contain <u>a nucleus</u>.
