1. The Necessities of Life
Chapter 2 Section 2
The Necessities of Life

2. Producer: an organism that can make its own food by using energy from its surrounded.
Consumer: an organism that eats other organisms or organic matter.

3. Decomposer: an organism that gets energy by breaking down the remains of dead organisms or animal wastes and consuming or absorbing the nutrients.

4. Protein: a molecule that is made up of amino acids and that is needed to build and repair body structures and to regulate processes in the body.

5. Carbohydrate: a class of molecules that includes sugars, starches, and fiber.
Lipid: a fat molecule or a molecule that has similar properties.

6. Phospholipid: a lipid that contains phosphorus and that is a structural component in cell membranes.
ATP: adenosine triphosphate, a molecule that acts as the main energy source for cell processes.

7. Nucleic acid: a molecule made up of subunits called nucleotides.
Water: essential substance, along with food and air, that cells in almost all living things need to function.