| A | B |
|---|
| cell | the smallest unit that can perform all life processes |
| cytology | the study of cells |
| stimulus | anything that causes a reaction or change in an organism or any part of an organism |
| homeostasis | the maintenance of a constant internal state in a changing environment |
| sexual reproduction | reproduction in which the sex cells from two parents unite, producing offspring that share traits from both parents |
| asexual reproduction | reproduction that does not involve the union of sex cells and in which one parent produces offspring identical to itself |
| heredity | the passing of genetic traits from parent to offspring |
| metabolism | the sum of all chemical processes that occur in an organism |
| producer | an organism that can make its own food by using energy from its surroundings |
| consumer | an organism that eats other organisms or organic matter |
| decomposer | an organism that gets energy by breaking down the remains of dead organisms or animal wastes and consuming or absorbing the nutrients |
| ATP | a molecule that acts as the main energy source for cell processes |
| organelle | one of the small bodies in a cell's cytoplasm that are specialized to perform a specific function |
| Anton Von Leeuwenhoek | credited with the invention of the microscope |
| prokaryote | an organism that consists of a single cell that does not have a nucleus |
| eukaryote | an organism made up of cells that have a nucleus enclosed by a membrane |
| cytoskeleton | a web of protein in the cytoplasm that acts as both a muscle and a skeleton and keeps the cell's membranes from collapsing. |
| tissue | a group of similar cells that perform a common function |
| organ | a collection of tissues that carry out a specialized function of the body |
| organ system | a group of organs that work together to perform body functions |
| organism | a living thing; anything that can carry out life processes independently |
| structure | the arrangement of parts in an organism |
| function | the special, normal or proper activity of an organ or part |
| Robert Hooke | credited with discovering cells after observing a thing piece of cork |
