| A | B |
| Biennial | plant that lives for 2 years |
| binomial nomenclature | naming system with 2 latin names |
| biological clock | set of mechanisms linked to cycles |
| C4 cycle | alternative photosynthetic pathway found in areas of low carbon dioxide |
| calvin cycle | process in plants where carbon dioxide is made into glucose (sugar) |
| carotenoids | chemicals (pigments) of red, yellow and orange in plants |
| circadian | repeated every 24 hours |
| chimera | having genetically different tissue (plant graft or organ transplant) |
| cline | gradual change in characterists |
| coevolution | joint development |
| colony | group of organisms |
| competition | struggle between organisms |
| conditioning | method of controlling behavior |
| continental drift | theory of continent movement |
| deciduous | trees that lose their leaves |
| dicotyledon | plant with 2 seed leaves |
| dioecious | male and female in separate plants |
| diurnal | happening during the day |
| dormant | inactive state |
| entropy | measure of disorder |