Across
- 2. something that pollutes, esp. a waste substance that makes air, water, or land
- 4. a way of hiding something by covering or coloring it so that it looks like its
- 7. to fill with more inhabitants than available resources can sustain
- 8. a variety
Down
- 1. a natural process of evolution in which the organisms that are best
- 3. an animal that hunts other animals for food
- 5. to their environment survive and are able to reproduce, while those that are weak leave fewer or no offspring
- 6. or unhealthy; contaminant