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Poison
The useful effects of algae is that it provides oxygen for various living things. Algae is also a food resource for humans and fish. Algae can become harmful if they produce toxins. Too much algae in the water can kill fish because the algae consumes a great amount of oxygen and can block the sunlight from reaching underwater.
ewan ko
Chlamydomonas is not harmful to us because it is a photosynthetic organism Also a green Algae
No, algae are not harmful unless it dies. (Found this answer on Yahoo.com)
Some green algae are unicellular
Water algae can be harmful but most of them are not... Just dont eat any:) :) lol
to whom? to what? harmful is a purely subjective term
blue green algae
Some of the types of algae are staghorn algae, black brush or beard algae, green spot algae, and green thread hair algae. Other types of algae are green water algae, and black green algae.
**** yes