The answer is D hope I helped
In an ecosystem, there are producers of food and there are consumers. The consumers can be herbivores that consume plants or carnivores (that predate on other consumers). In the case of a particular food chain, the removal or modification of consumers or producers severely affects the other.
Answer: A) Experimental effect.
Explanation:
The experimental effect is a cognitive bias exerted by the researcher who exerts an unconscious influence on the expectations that the participant of an experiment has about the results of an experiment will have.
For example, by telling a participant in an experiment that the results will be negative, an influence is exerted which makes the results more likely to be negative.
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