| A | B |
| Necessary elements for photosynthesis | sunlight, water and carbon dioxide |
| Photosynthesis produces | energy, glucose and oxygen |
| Chemosynthesis | a method of energy production that doesn't involve sunlight |
| Decomposer | organism that obtains nutrients and energy by breaking down dead plants and animals |
| Producers get nutrients through the action of | decomposers |
| All ecosystems depend on | energy and producers |
| Phytoplankton | producers in a marine environment |
| Decomposer | bacteria |
| Process in which organisms make food | photosynthesis and chemosynthesis |
| A stable ecosystem depends on | decomposers |
| Producer | organism that makes its own food |
| Consumer | will eat a producer or other consumer |
| A carnivore will eat | herbivores, carnivores and omnivores |
| Energy | the ability to do work |
| Herbivores | deer and rabbits |
| Predator-prey | interaction between two organisms of different species where one eats the other |
| Decomposers | are consumers |
| Phytoplankton | the most common producer in the ocean |
| Glucose | a simple sugar molecole |