B4.2 Ecological Niches

4. obtain nutrients by external digestion of food.
7. survives in the presence of oxygen and requires oxygen to live.
11. necessity of life.
14. oxygen is a ___ factor that determines where an organism can live.
15. produces a burning sensation in the digestive system of many herbivores.
17. make their own food using chemical reactions.
18. must contain all of the resources an organism needs to survive.
21. process of discharging undigested or waste material.
22. all animals are ____.
23. niche that an organism does occupy due to competition from other species.
24. the role of an organism in an ecosystem.
26. process of nutrition that takes place inside an organism.
28. behave as an autotroph by carrying out photosynthesis + act as heterotrophs by feeding on other organisms.
30. close external resemblance of an animal or plant to another animal/plan/inanimate object.
31. able to make their own food using sunlight energy.
32. “no two species can occupy the same niche.”
33. niche that an organism could potentially occupy in the absence of competition from other species.

1. oxygen in the environment is absent.
2. mode of nutrition in plants and algae.
3. survives in the presence of oxygen but doesn't require oxygen to live.
5. one example of an obligate aerobe.
6. one example of a facultative anaerobe.
8. oxygen in the environment is greatly reduced.
9. the act of having adaptations to the ecological niche which they occupy to avoid competition.
10. armour or protective coverings is an example of _____.
12. dies in the presence of oxygen and doesn't require oxygen to survive.
13. making food apart of cell.
16. used to kill prey, which include the production of venom in glands.
19. type of niche that fits into the tolerance and optimum range.
20. herbivores and had very large flat molars.
25. one example of an obligate anaerobe and Gram-positive bacteria.
27. organisms that are able to make their own food.
29. live in extreme environments such as hot springs.