The correct answer is option B and C, that is, they do not share similar stimulus characteristics and include a restricted number of stimuli.
An arbitrary stimulus class refers to predecessor stimuli, which induce the similar reaction, however, they do not share relational feature and do not resemble each other in physical form. For example, cheese, peanuts, chicken breasts, and coconut milk are the members of an arbitrary stimulus class if they induce the response, that is, sources of protein.
Answer:
the answer is plant growth
A small cell lived inside a larger cell to the benefit of both cells.
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Answer:
Replacing a lipid containing 18 C fatty acids with one containing 16 C fatty acids.