Which statement best compares multi-celled organisms to single-celled organisms?
A.
Multi-celled organisms always get energy differently than single-celled organisms.


B.
Single-celled organisms carry out fewer life functions than multi-celled organisms.


C.
Single-celled organisms are always larger than multi-celled organisms, but multi-celled organisms always perform more functions.


D.
Multi-celled organisms have many cells that perform different functions, and single-celled organisms perform all functions within one cell.