Unit 3B

4. An increase in the amount of nutrients, such as nitrates, in a marine or aquatic ecosystem
5. An organism that eats other organic matter instead of producing its own nutrients or obtaining nutrients from inorganic sources
6. cycle The process in which nitrogen circulates among the air, soil, water, plants, and animals in an ecosystem
10. cycle The cyclic movement of phosphorus in different chemical forms from the environment to organisms and then back to the environment
11. Bloom a rapid increase or accumulation in the population of algae in freshwater or marine water systems, and is recognized by the discoloration in the water from their pigments
14. Consumer a carnivore at the topmost level in a food chain that feeds on other carnivores
15. Web A diagram that shows the feeding relationships between organisms in an ecosystem

1. The process by which plants, algae, and some bacteria use sunlight, carbon dioxide, and water to produce carbohydrates and oxygen
2. An organism that feeds by breaking down organic matter from dead organisms
3. organism that feeds on primary producers. Organisms of this type make up the second trophic level and are consumed or predated by secondary consumers, tertiary consumers or apex predators
7. level One of the steps in a food chain or food pyramid
8. An organism that can make organic molecules from inorganic molecules
9. Consumer an organism that feeds on primary producers. Organisms of this type make up the second trophic level and are consumed or predated by secondary consumers, tertiary consumers or apex predators
12. organism that feeds on primary producers. Organisms of this type make up the second trophic level and are consumed or predated by secondary consumers, tertiary consumers or apex predators
13. Cycle The movement of carbon from the nonliving environment into living things and back