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Feeding on dead organisms and organic waste is a large part of which organisms’ niche?
A. Omnivores
B. Producers
C. Herbivores
D. Decomposers
Please help!

1. An organism’s ______ is the role it has in its habitat
A. niche
B. survival
C. succession
D. mutualism
2. The changes in an abandoned field over time are known as _____
A. weathering
B. succession
C. climax
D. homeostasis
3. ____ use the sun’s energy to make complex organic compounds
A. Consumers
B. Producers
C. Decomposers
D. Predators
4._____ are organism’s that break down organic wastes.
A. Consumers
B. Producers
C. Decomposers
D. Predators
5. Large populations of producers are needed to support a small population of
A. scavengers
B. parasites
C. decomposers
D. consumers
6. Which one of the following is an example of a second-order consumer?
A. deer
B. rabbit
C. fox
D. grasshopper
7. Animals that are fed upon by predators are called
A. game
B. mimics
C. populations
D. prey
8. Consumers that feed on dead organisms are
A. parasites
B. scavengers
C. predators
D. pathogens
9. _______ is an association between different species of organisms that is beneficial to both
A. Parasitism
B. Consumerism
C. Mitosis
D. Mutualism
10. A walking stick insect can be mistaken for a twig. This adaptation is
A. competition
B. mimicry
C. strategy
D. limitation
11. Which of the following is a physical factor in an ecosystem?
A. Community
B. water
C. plant
D. bacteria
12. The nitrogen cycle is important because all organisms need nitrogen
A. in the air
B. for photosynthesis
C. to produce ammonia
D. to make proteins
13. Some kangaroos in Australia graze on low-growing plants. Reindeer in the far north also eat low-growing plants. This shows that both have similar
A. niches
B. biomes
C. succession
D. habitats
14. Continued succession in a community will result in
A. natural selection
B. a forest
C. a new ecosystem
D. a stable community