Across
- 2. Between 80% and 90% of the food energy taken in by you and other organisms are used for chemical reactions in the body and is lost to the ecosystem as what?
- 5. Food pyramids are also referred to as this.
- 7. The breaking down of organic wastes and dead organisms.
- 9. These obtain their energy by eating primary producers.
- 10. A secondary consumer that eats primarily consumers.
- 11. The action of living organisms such as bacteria to break down dead organic matter.
- 14. Food pyramids illustrate that most of the Sun's energy that is trapped by ______ flows out of an ecosystem.
- 15. Plants are called this because they form carbohydrates during photosynthesis.
- 18. An insect such as a bee that feeds on a plant such as a sunflower is an example of this.
- 19. The lower the trophic level, the ______ the number of organisms that can be supported by the ecosystem.
- 20. Hawk, weasel, rabbit, grass; which of these organisms is at the top of the trophic level?
- 21. Primary consumers that eat plants, like grasshoppers, are __________.
Down
- 1. These change wastes and dead organisms into usable nutrients.
- 3. Hawks and sea otters that feed on secondary consumers to obtain energy are which type of consumer?
- 4. The total mass of living plants, animals, and fungi.
- 6. Plants and algae are examples of this.
- 8. A model that shows the loss of energy from one trophic level to another.
- 12. These consumers obtain their energy and nutrients by eating the bodies of small dead animals, dead plant matter, and animal wastes.
- 13. What are the steps in the food chain called?
- 16. The primary producers that support marine life in aquatic food chains.
- 17. A model that shows the flow of energy from plant to animal and from animal to animal.