Cellular respiration is the name for the process of breaking down organic molecules in the presence of oxygen. Which of these processes is the opposite chemical reaction?

Which ideas did your answer contain? check all that apply. no food for organisms no oxygen in the atmosphere no trees or flowering plants no products based on trees or plants (building materials, medicines, fuels, fibers) no fossil fuels

How are fossils used to date organisms?

What blood vessels carry blood to the heart? away from the heart?