How do the structures of different types of animals allow them to obtain energy and eliminate waste?be a long explanation

The structures of different types of animals usually  allow them to obtain energy and eliminate waste through the due course of evolution the organisms have adopted various structural changes that enables them to digest food particles and eliminate waste.

A plant growing towards sunlight is a classic example of an organism changing its morphology for the environment or its food, similarly all organisms have devised their metabolism that is fueled by the digestive system to ease their energy gaining process followed by waste removal.

an adaptation is a change or process by which an organism takes to be better suited for its environment. for example; migration is a behavioral adaptation, this is needed because birds are not built to last extremely cold climates. there are different adaptations because there are different species needing to adjust to different things, bears don't migrate; they hibernate.