Nervous System, Endocrine System & Ecosystems

3. relationship between organisms that are trying to use the same limited resource
10. part of the brain that controls conscious thoughts, and the movement of every body part
11. organisms in a food chain that feeds on other organisms
14. when an ecosystem has the ability to maintain suitable living conditions for the community
16. the molecule that is going to be changed by the chemical reaction involving an enzyme
17. a chemical message released at the end of an axon to be received by the next neuron's dendrites
19. all the chemical reactions occurring in the cells
21. any feature that assists an organism to survive and reproduce in its environment
22. organisms that break down the bodies of dead organisms and animal wastes and recycle materials

1. a chemical that speeds up a rate of reaction
2. a non-living factor of the environment
4. relationship between two organisms living closely together, where each benefits
5. organisms that make food for the community
6. relationship where one organism benefits and another organism is unharmed
7. branches from the cell body that receive messages from other neurons
8. the range of different species in a community
9. a place where organisms and their physical surroundings form an environment that is different from others nearby
12. the gland that controls the activities of other endocrine glands
13. portion of the brain that constantly check the internal environment of the body
15. a nerve cell
18. any factor that stimulates a receptor and brings about a response
20. the process of maintaining a constant internal environment