I think the answer is A True I’m not 100% sure though sorry
Yes, humans are a keystone species by virtue of their technology<span> as well as the manner in which they influence their natural habitat. If humans were to become extinct, pets, </span>livestocks<span>, and crop plants would also follow. On the other hand, the species that would likely grow in number would be mountain </span>gorillas, whales and weeds. <span> </span>
I believe this would be referred to as the biomass.
The discovery of independent DNA (from the host) in mitochondria and chloroplasts supports the endosymbiotic theory.