The raw materials used by plants to make food are .
carbon and oxygen
oxygen and water
carbon dioxide and water
sugar and oxygen

Choose the molecule that is described by each phrase. energy used during long activities:

Identify the composition of oceanic and continental crystal rocks.in a model of earth’s interior,where would these rocks appear?

Which of the following statements is true about the relationship between genetic variation and natural selection? a. genetic variation must be present in a population before natural selection can act on it. b. genetic variation arises in a population as a result of natural selection. c. natural selection can act on a population whether there is genetic variation within the population or not. d. after natural selection acts on a population, the amount of genetic variation in the population always increases.