Which of the following statements is true? A)All compounds are molecules.
B)All molecules are compounds.
C)Molecules are made up of ionic bonds.
D)Compounds are only composed of covalent bonds.

unicellular organisms, like bacteria, are able to perform all life functions within one single cell. multicellular organisms need many different types of cells to carry out the same life processes. each of these special types of cells has a different structure that it perform a specific function.