In an experiment testing the effects of a treatment, a comparison grouprefers to a group of units (e.g., persons, classrooms) that receive either no TREATMENT or an alternative treatment.
It would be all of them but b and c are the best answers because Fossils show the evolution of their related species or organisms
Powhatan Confederacy were the indigenous people of Virginia. The based their life on hunting and gathering. It was a small group of people living in Virginia. The Powhatan Confederacy and the British settlers did not have a good relation from the beginning. The british settlers thought that they would be accepted by the natives of Virginia, but it actually started a conflict between them and was the major reason behind the fall of the Powhatan Confederacy. The settlers thought that the Powhatan Confederacy would be the suppliers of food after their arrival, but the natives did not have much extra food. This started the main conflict.
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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