13. Mutualism, commensalism, and parasitism are the three types of
A. symbiotic relationships
B. predation
C. competition
D. prey adaptations
14. The study of how things interact with each other and with their environment is called
A. ecology
B. photosynthesis
C. community
D. biotic studies
15. Nonliving parts of an ecosystem are called
A. populations
B. organisms
C. biotic factors
D. abiotic factors
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Answer:
13. Symbiotic Relationships (A) - Symbiotic relationships are types of relationship wherein there are two organisms involved, but only one benefits (mutualism, commensalism, and parasitism are types of symbiotic relationships).
14. Ecology (A)
15. Abiotic Factors (D) - Abiotic factors are the opposite of biotic factors (biotic factors refers to the living things of an ecosystem).