to whom? to what? harmful is a purely subjective term
No, algae are not harmful unless it dies. (Found this answer on Yahoo.com)
Water algae can be harmful but most of them are not... Just dont eat any:) :) lol
**** yes
no not at all
Algae is harmful to people and animals depending on season Seaweed is a type of algae.
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
Some algae in the red tide contains a poison that can kill fish.
Chlamydomonas is not harmful to us because it is a photosynthetic organism Also a green Algae
No, all algae are not harmful to sea life. Some algae provide food to several marine animals.
a green leo jin of shark and ball