Answer: adaptation i think sorry if im wrong
Explanation:
Carbon(C),every living creature has carbon, oxygen(O),hydrogen(H), nitrogen(N) mainly in proteins,phosphorus(P) mainly in DNA and RNA, sulfur(S).
Subsets of {dog, cat, fish} are Ф, {dog}, {cat}, {fish}, {dog, cat}, {dog, fish}, {cat, fish}, {dog, cat, fish}.
Answer:
look below
Explanation:
1) keep toxic substances out of the cell
2) allows certain minerals in that are needed and keeps others out and uses reciptors to do so
3) they separate vital but incompatible metabolic processes conducted within organelles