What body system is involved with removing waste in animal cells?

There are six elements that make up most of the human body. which of the following is not one of these six elements?

Several bird species feed in a certain species of tree. each bird species feeds in a different part of the tree. which statement is true of these bird species? a. they have adapted to different niches due to competition b. they have a carnivorous relationship with the tree species. c. they have adapted to different niches due to predation d. they have a symbiotic relationship with the tree species.

Which phase of the cell cycle ensures that identical copies of the dna are made for daughter cells?