UNIT 9

5. — The part of the ocean where sunlight cannot reach
9. Exclusion Principle — No two species can occupy the same niche in the same habitat at the same time indefinitely
10. Biomes — Ecosystems that are water-based, such as oceans, rivers, and lakes
12. Community — A group of many interacting species living together in the same ecosystem

1. — The cutting down or removal of large areas of forests
2. — Harmful substances or contamination introduced into the environment
3. — A large region characterized by a specific climate and typical plants and animals
4. — The part of the ocean where sunlight penetrates and photosynthesis can occur
6. Species — The first species to colonize a newly formed or disturbed environment
7. species — Species that are found naturally only in one specific geographic location
8. Biome — A land-based ecosystem such as forests, deserts, or grasslands
11. Web — A system of interconnected food chains showing energy flow in an ecosystem