Control group
Explanation:
Experiments are usually designed so that the differences between the experiment and control groups can be observed.
- The experimental group is the group that follows the details of the hypothesis where variables are changed to see their causes and effects.
- The control group is the standard by which the experimental group is compared with.
- The variables are being tested for in the experimental group to see how they are changing .
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I am certain that placing pressure on a cut will constrict blood vessels manually, and encourages vascular spasms.
Vascular spasms are sudden, brief tightening of the muscle cells inside the walls of a blood vessels. It is the first response as the blood vessels constrict to allow less blood to be lost. In the second step, platelet plug formation, platelet stick together to form a temporary seal to cover the break in the vessel wall, the third step is the coagulation or blood clotting.
Burning fossil fuels create:
Energy and carbon dioxide
The reason that organisms cannot produce populations of unlimited size is that
A. interactions between organisms are unchanging
B. there is no carrying capacity on Earth
C. species rarely compete with one another
<u>D. the resources of Earth are finite</u>