How do daily human activities affect the ecosystem? . . a. they release poisonous chemicals in the environment, leading to disruption of food chains.. . b.. they lead to the vanishing of forests, causing mass extinction of species.. . c.they lead to drought conditions, causing acute water scarcity..

Answer A is correct because humans release tons of chemicals into the environment every single day. All it takes to disrupt an entire ecosystem is a chemical released into their water source, which in time slowly poisons the animals. Say a rabbit was drinking the polluted water and is now carrying the poison in it's body. A coyote comes along and eats the poisoned rabbit, and the coyote is now poisoned. That threw off the natural food chain.

Bacteria: no nucleus is present in cells. Archaea: There is no nucleus in the cells; they have a different cell wall than bacteria. Eukarya: cells do have a nucleus in them.