1. a. <span>is a possible explanation for events using prior knowledge
An inference </span><span>is a possible explanation for events using prior knowledge, therefore, inference is an educated guess which can provide a logical reasoning to an object, phenomenon or circumstance.
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<span><span>2. d. the amount of time ...
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</span>Since the amount of time can't clearly be controlled but only observed the other factors which is water, soil and type of plant can be manipulated in the study.
Answer:
sympathetic nervous system
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