Are humans keystone species?

Answer 1

Yes (at least based on my understanding of a keystone species)

A keystone species is a group of living organisms that have a dramatic effect on the overall ecosystem (often disproportionate to their relative population size).

I don't believe that it could be argued that humans do not have such an effect.

Note we might make value judgements on whether that effect is positive or negative but such evaluations do not effect the definition.

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Answer 2

Lydia Adams

Yes, humans are considered a keystone species due to their significant influence on ecosystems and biodiversity, often affecting the survival of other species within their habitats.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.