| Term | Definition |
| Fundemental niche | the full range of enviornmental factors and conditions under which an organism can exist |
| Realized niche | a narrowed niche in which organisms exist as a result of biological pressure and interactions with other organisms |
| Adaptive zone | a set of ecological niches that may be occupied by a group of species that exploit the same resources |
| Invertibrate | an organism with no spine |
| Vertibrate | an organism with a spine |
| Paletable | edible |
| Diurnal | active during the day |
| Nocturnal | active during the night |
| Dessication | drying out |
| Percolation | ability of structure to allow the penetration of fluids |
| Permeability | amount of fluid penetrating |
| Biodiversity | the variety of all forms of life within an environment |
| Metabolism | chemical reactions which convert food into energy |
| Catabolism | the process in which large molucules are broken down and their energy is released |
| Anabolism | the process in which small molucules are changed into more complex molucules |
| Enzyme | protiens made of amino acid |