1. What does destruction refer?

During this process, vitamins are released that we absorb into our bloodstream. 
This is an example of which symbiotic relationship?
A) Symbiosis
B) Mutualism
C) Competition
D) Predation
E) Proto cooperation
237. In a food web, arrows point in just one direction because they show:
A) how energy goes to the animal that is eating
B) which animals are related
C) how energy goes to the animal that is eaten
D) which animal is turning to dead material
E) which animal is bigger
238. In the food web, which is the correct flow of energy?

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A) ACF
B) ACD
C) DCA
D) BAF
E) DBA
239. In the food web, what two organisms are competing for food?

A) D and F

B) A and B
C) A and C
D) D and E
E) B and D
240. Which of the following descriptions about the organization of an ecosystem is 
correct?
A) Populations make up species, which make up communities
B) Species make up communities, which make up populations
C) Communities make up populations, which make up speices
D) Species make up populations, which make up communities
E) Communities make up species, which make up populations
241. The lowest level of environmental complexity that includes living and nonliving 
factors is the
A) Ecosystem
B) Biome
C) Community
D) Biosphere
E) Population
242. Most of the energy available to a consumer trophic level is used by organisms 
for:
A) respiration, movement, and reproduction

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B) performing photosynthesis
C) producing inorganic chemical compounds
D) transfer to the next trophic level
E) producing organic from inorganic material