Answer:
Opportunity cost is the cost of a foregone alternative. If you chose one alternative over another, then the cost of choosing that alternative is an opportunity cost. Opportunity cost is the benefits you lose by choosing one alternative over another one.
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The goverment was not strong enough to keep the articles of confederation
PSAT stands for Preliminary SAT, where SAT is the Scholastic Aptitude test. It is a standardized test that allows for a nation-wide comparison of students. The results of the test are relevant for the National Merit Scholarship program.
The correct answer is B; Adaptive theory.
Further Explanation:
The adaptive theory is also known as the evolution theory. Sleep is thought to be an evolution and that when a person is sleeping their body is conserving the energy that they need to function. This theory beleives that all humans and other species have evolved throughout time and only sleep when it is hazardous to their life.
Research has shown that animals that all animals who have only a a few natural predators will sleep up to 15 hours a day. The animals who have numerous predators will sleep only a few hours, up to five hours, a day.
There are four theories of why we sleep, they are;
- Repair and Restoration Theory
- Evolutionary Theory (adaptive)
- Information Consolidation Theory
- The Clean-Up Theory
Learn more about sleep theories at brainly.com/question/13044986
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