I believe they cannot start with big trees and bushes because the there is not enough nutrients in the soil, so instead pioneer species pave the way for primary succession.
Animal action is physical weathering
This could be two answers Water or Oxygen. I would go with water because it contains oxygen therefore making it a possible answer. Hope I helped. :)
Answer:
operant conditioning
Explanation:
In operant conditioning, organisms learn to associate events that repeatedly happen together. The word "operant" should be changed to the word "classical." any relatively permanent change in behavior brought about by experience or practice.
hope it helps : )
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