7. A group of giraffes feeds on leaves and grasses during the daytime. Right now, it is dark out and the giraffes are not eating. Is carbon moving INTO the living things, moving OUT OF the living things,
or BOTH?

When can a hypothesis be elevated to the status of a theory? a) when it is validated by an experiment b) when data gathered from an experiment precisely fits predictions c) when it can be proved to be true d) when it meets the test of repeated experimentation