Your answer should be WHO.
Think of it like this: You wouldn't say "The boy it (a variant of 'which')", because it simply just sounds odd. Instead, you're wired to think "The boy, he (an unknown name, so it would be 'who')".
Answer:
Mother Nature also instructed other animals to work together.
Explanation:
The summary is talking about the ants. You don't need the detail of Mother Nature instructing the other animals, you only need details about the ants since the story is about how the ants learned to work hard.
The hard work that everyone around you puts in while you're doing nothing
Satan,[a] also known as the Devil,[b] is an entity in the Abrahamic religions that seduces humans into sin or falsehood. In Christianity and Islam, he is usually seen as either a fallen angel or a jinn, who used to possess great piety and beauty, but rebelled against God, who nevertheless allows him temporary power over the fallen world and a host of demons. In Judaism, Satan is typically regarded as a metaphor for the yetzer hara, or "evil inclination", or as an agent subservient to God.