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1. The organic compounds in living things are organized into groups: carbohydrates, lipids, proteins, and nucleic acids. Which two groups of compounds do living things most commonly use as an energy source?
   

(A carbohydrates and lipids)

B proteins and nucleic acids

C proteins and carbohydrates

D lipids and nucleic acids

1. Which statement is true about the cells in multicell organisms?
   

(A They usually have certain special functions. )

B They are prokaryotic cells.

C They can all turn into the same kind of cell if needed.

D They are all identical.

1. Which statement about energy is true for all living things?
   

A Energy comes only from sunlight.

B Plants convert ATP into glucose for energy.

(C Organisms require energy for survival.)

D Energy cannot be transferred from one organism to another.