| A | B |
|---|
| Abiotic | an environmental factor not associated with the activities of living organisms |
| Biotic | factors in an environment relating to, caused by, or produced by living organisms |
| Life Cycle | the entire sequence of events in an organism’s growth and development |
| Membrane | a thin layer of tissue that surrounds or lines a cell, a group of cells, or a cavity; any barrier separating two fluids |
| Microscopic | relating to an object too small to be visible without the use of a microscope |
| Organ | a structure containing different tissues that are organized to carry out a specific function of the body (e.g., heart, lungs, brain, etc.) |
| Organism | any living plant, animal, or fungus that maintains various vital processes necessary for life |
| Permeability | the capability of a porous substance or membrane to allow a fluid or gas to enter it; the measure or degree to which a substance can be penetrated by a liquid or gas |
| Stimulus | a condition that produces a response |
| Tissue | similar cells acting to perform a specific function; four basic types of tissue are muscle, connective, nerve, and epidermal |
| Tropism | the motion of an organism or part of an organism toward or away from an external stimulus |
