Answer:
A. biological.
Explanation:
Psychology can be studied from many different perspectives. The biological perspective of studying psychology gave importance to genetics and the physical nature of human beings and animals. It is the study of human behavior that examines the nervous system, hormonal system or immune system. It is also called bio-psychology and it was the first perspective to use human genetics as the bases to study human behavior. Charles Darwin used this approach to study the role of genetics and its relation to human behavior.
As per the question, the study of testosterone and estrogen which are hormones signifies it as a study from a biological perspective.
Rivers, mountain ranges, historical points (railway, a wall, etc.)
Most country borders are divided by geographical points, and sometime just for political and historical reasons (what belonged, and waht should belong to whom).
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Nationally recognized testing laboratories (NRTL) <u>test and list</u> electrical products to provide a basis for approval by inspectors in the field.
An independent organization known as a Nationally Recognized Testing Laboratory (NRTL) certifies goods for the American market. OSHA (Occupational Safety and Health Administration) recognizes NRTLs for products used in American workplaces in accordance with Federal Code 29 CFR 1910.7.
The NRTL certificate offers unequivocal proof that your electrical and electronic products meet the specifications needed for the American market. NRTL certification helps you to quickly reach hundreds of millions of consumers by offering assurance that your products meet the safety requirements to enter the United States.
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