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.
Ovulation is the process in which eggs are released from the ovary.
A dichotomous key is very easy to use because it provides only two choices.
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