What is one of the main concerns related to the increase of waste materials humans put back into the environment?

well if you think about waste as something inferior to the enviroment, it will help you understand that birds eat whatever the waste is and fish eat it as well. So a main concern is dying species because of the waste

i think this may help

the generally accepted parts of modern cell theory include: all known living things are made up of one or more cells. all living cells arise from pre-existing cells by division. the cell is the fundamental unit of structure and function in all living organisms.