Question

keystone species balance the ecosystem so that all organisms can survive
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Explanation:

Keystone species play a crucial role in maintaining the structure of an ecological community. They have a disproportionately large effect on their environment relative to their abundance. By influencing factors such as food webs, nutrient cycling, and habitat availability, they help ensure that a wide variety of organisms can co - exist and survive within an ecosystem. For example, sea otters are a keystone species in kelp forest ecosystems. They control sea urchin populations. If sea urchin populations were to explode (in the absence of sea otters), they would overgraze kelp, destroying the habitat for many other species in the ecosystem.

Answer:

true