To be able to compare the results to a sample without any of the independent variable added.
Diseases are the most deadly compared to water supply, tornados, and access to food. And more and more people are dying from diseases as the world gets worse .
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Just by using current knowledge of our society today, this question explains itself for the answer choice of A. Teens think that they are capable of driving even though they only had "a few drinks". This is also the case with adults, because not all adults are responsible. Hope this helped!
Hydrosphere
Explanation:
- The dolphin swims in the hydrosphere.
- The hydropshere is the region occupied by water on the earth surface.
- They are the oceans, lakes, rivers, glaciers e.t.c
- The hydrosphere makes up 70% the total surface area on earth.
- Ocean occupies a whooping 95% of all.
- The hydrosphere is able to support aquatic life and this is why the dolphin with its streamlined body swims in this sphere.
Learn more:
Atmosphere brainly.com/question/1851697
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