Your body always needs energy. What do you use first, second, and third for energy?

Match the types of competition to their descriptions

Diffusion and osmosis are forms of passive transport

What does polymerase chain reaction (pcr) do? o a. separates dna fragments by size o b. cuts a dna sample into fragments o c. provides an overall picture of a person's chromosomes o d. makes more copies of a sample of dna