| A | B |
|---|
| Atom | The smallest chemical unit of matter |
| Molecule | Two or more atoms linked together to make a substance with unique properties |
| Photosynthesis | The process by which green plants and some other organisms use the energy of sunlight and simple chemicals to produce their own food |
| Metabolism | the sum total of all processes in an organism that convert energy and matter from outside sources and use that energy and matter to sustain the organism's life functions |
| Receptors | Special structures that allow living organisms to sense the conditions of their internal or external environment |
| Precocial | A term used to describe offspring that are born able to hear, see, move about, regulate body temperature, and eliminate waste without a parent's help |
| Altricial | A term used to describe offspring that are born without at least one of the following abilities: hear, see, move about, regulate body temperature, or eliminate waste |
| Cell | The smallest unit of life in creation |
