What are some examples of how environmental factors affect genetic variation and influence natural selection

Which list shows the levels of organization of an organism in hierarchical order from left to right, from the smallest to the most complex?

Which layer will become saturated first when rain falls?

Anurse is in the dining room and overhears a new nurse tell a client with body dysmorphic disorder that she's much too thin and must eat more before she can go home. the client bursts into tears and runs out of the dining room. what is the best way for the nurse to address this situation?