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.

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