Humans are considered a diverse population because of how many different kinds of us there are, how many different things we make/build, and how we interact with animals and the environment. <span />
Communities with many different species have a high index of diversity, this will enable the communities to withstand environmental changes better than communities with only a few species or with low index of diversity...
The answer in the space provided is anaerobic respiration.
It is because this allows of having to utilize other substance than oxygen such
as nitrate or sulfate to be their electron acceptors in which is for organisms
that undergoes respiration.
