A. Earth worms
Because it can only flow one way
The lion is most similar to a tiger, because both are members of the same genus. The gray wolf and coyote belong to different genera, the aardwolf belongs to a different family, and the whale belongs to a different order.
As a parent you are responsible for another human for a lifetime. They rely on you to keep them healthy and to provide them with everything that they need to survive.
