| A | B |
| organism | A complete living thing |
| cell | The tiny, living, structural, and functional unit of all living things, smallest living unit |
| cytoplasm | All the material, except the nucleus, inside a cell. |
| unicellular organism | A living thing composed entirely of one cell. |
| multicellular organism | A living thing that is composed of more than one cell and whose individual cells are not normally able to live singly apart from the organism. |
| tissue | A group of similar cells that together perform a specific function. |
| colonial organism | A living thing that is composed of a group of similar cells living together but one cell can live on its own. |
| energy | The ability to do work |
| physical life | A characteristic produced when organized systems of nonliving substances use energy and maintain the characteristics of living things. |
| spiritual life | Man's relationship with God |
| cell theory | The theory that all living things are made up of microscopic units called cells and that cells carry on the functions of living things. |
| molecule | The smallest unit existing s a particular substance. |
| carbohydrate | A substance that contains only carbon, hydrogen, and oxygen, sugar or starch. |
| protein | A substance ade of long chains of amino acids serving as an enzymes and building blocks |
| nucleic acid | A molecule that contains the genetic information of a cell; DNA and RNA are the main types. |
| lipid | A substance such as fat or oil, not soluble in water; an important component of membranes. |