There are different kinds of research. The three sources are the two individuals and their combination as a pair.
<h3>What is relationship research?</h3>
A causal relationship is known to be one where one variable leads to a change in another variable.
These kinds of relationships are researched on by experimental research so as to know if changes in one variable do leads to effects in changes in another variable.
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Answer:
Opportunity Costs
Explanation:
According to my research on studies conducted by fitness professionals, I can say that based on the information provided within the question the principle that best illustrates this situation would be Opportunity Costs. This term is defined as the loss of other alternatives when one alternative is chosen. Which is what is happening in this situation, since whatever training Jacques decides on she has to give up the other two.
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Answer: This is fundamentally due to COGNITIVE DEVELOPMENT.
Explanation: Cognitive Development in the field of Psychology and neuroscience explains how an individual develops in terms of information processing, conceptual resources, perceptual skill, language learning, and other aspects of the developed adult brain.
Brian and his friends as youth are able to challenge their youth pastor due to information processing and perceptual skill which is an aspect of COGNITIVE DEVELOPMENT.