science

2. a particular example that is investigated in depth to improve our understanding of general principles
8. something that is used as a comparison to check the results of a scientific experiment
9. wild
10. a set of interconnected food chains
13. a group of similar living things that are capable of breeding with each other
16. the control of a pest's population by introducing a competitor or predator
18. an animal that is hunted and eaten by another animal
19. a living thing
23. an animal that preys on other animals for food and is not preyed on by any other species; located at the top of a food chain or food web
24. something that threatens the health of an ecosystem
25. to get rid of
26. a living thing that can produce its own food, usually by using sunlight to carry out photosynthesis

1. a species that is introduced to a new area and then causes harm to the ecosystem and/or humans
3. the natural environment in which an organism usually lives
4. producing a poison that can be injected into prey (e.g. some snakes and spiders)
5. someone who tries to protect and preserve species
6. an animal that hunts and kills other animals for food
7. a fine powder released by the male parts of flowers so the plant can reproduce
11. the scientific study of ecosystems, a branch of biology
12. a living thing that feeds on producers; for example, an animal that feeds on plants
14. a community of living things interacting with each other and with their non-living environment
15. a series of species in an ecosystem where each species is food for the next in the chain
17. a type of mammal that gives birth to underdeveloped young that are nurtured in a pouch on the mother's belly
20. the variety of life on Earth or within a particular region
21. a living thing that obtains its food by eating other living things
22. an animal, such as a bird, that moves pollen from one plant to another allowing the plant to reproduce