Yes
sunlight
Algae used to come under fungus, but now it is in its own group. It falls under eukaryote.
Most of the time sponges eat algae and when fish come by the sponge sometimes sucks of algae.
The splitting of H20.
Depletion of ozone lets the UV to come in. These UV if fall on blue-green algae can destroy them.
There are six phyla of algae, three of which are red, green, and brown. Algae have no roots, no stems, and no leaves, yet are plant-like. Algae are protists.
Cray fish live in an environment where there are many types of algae without any bad effect however there are certain types of algae that can kill the creatures that come in contact with them either because they are toxic or because there is too much of it.
Click on the link to your right for algae info, if the question is about algae in the pool read below: Algae are tiny microscopic plants that enter your pool by rain, wind and fill water. If allowed to grow unchecked, your water will quickly become unusable. One ounce of water can contain millions of algae cells before they are visible. They can clog filters and reduce water circulation and the effectiveness of pool chemicals. The main types of pool algae are: Green Algae: The most common type of algae. It
70% comes from green algae & cyanobacteria and the rest, it comes from plants
well when you leave your pool covered for the winter, you are unable to put chlorine into it. Chlorine prevents algae so to answer your question, the lack of chlorine causes 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.