Question

Which of the following statements best describes how organisms such as rabbits obtain the carbon necessary for building biological molecules?

A. Rabbits eat plants and use energy absorbed from the plants to make carbon atoms from electrons, protons, and neutrons in the air.
B. Rabbits eat plants and break down plant molecules to obtain carbon and other atoms that they rearrange into new carbon-containing molecules.
C. Rabbits eat plants and use water absorbed from the plants to hydrolyze CO2CO2, which the rabbits breathe in from the air and use as a carbon source.
D. Rabbits eat plants and make carbon-containing molecules by using carbon atoms that the plants absorbed from the soil and stored in the cells of their leaves.

Answer 1

Rabbits get their carbon from eating plant molecules, which they then rearrange into new carbon-containing molecules. This is how rabbits get the carbon they need to make biological molecules.

Carbon is a necessary component for all of Earth's life. The intake and release of carbon is a component of all plant and animal life. Since the rabbit is a heterotroph, it is unable to synthesize its own food. These life forms either take in carbon to assist in the production of food or release carbon as part of respiration. Rabbits consume green plants and, as part of the carbon cycle, break down plant molecules like cellulose, glucose, starches, fats, and proteins into simple substances that can be used to produce energy and rearrange them into new carbon-containing structures and molecules.

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