The study of the interrelationship of organisms and their environments is referred to as select one of the options below as your a. homeostasis b. ecology c. food webs d. energy pyramids

The study of the interrelationship of organisms and their environments is referred to as "ecology". This is different from studying organisms or environments separately in that it looks at cause and effect relationships between the two. 

Ifound this information on google “yes. they have a mouth and brain at one end and an anus at the opposite end. what characteristics distinguish an annelid from other worms? annelids have segmented bodies and a coelem which is a tube filled with fluid and contains most of the organs.“ i hope it you