Question

Algae write 5 lines and its usefull and harmfullness
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Answer 1

Answer:

A harmful algal bloom (HAB) contains organisms (usually algae, hence the name) that can severely lower oxygen levels in natural waters, killing organisms in marine or fresh waters. Some HABs are associated with algae-produced toxins.[1] Blooms can last from a few days to many months. After the bloom dies, the microbes that decompose the dead algae use up even more of the oxygen (generating a "dead zone"), which can cause fish die-offs. When these zones of depleted oxygen cover a large area for an extended period of time, neither fish nor plants are able to survive.