C. Desert
A. The tilt of the Earth's axis as it circles the Sun.
2,996 people were killed and more than 6,000 others were wounded during the attacks, moment of silence for all those poor people and their families.
Higher atmospheric pressure and stronger greenhouse effect leads to the presence of water on the surface of Mars planet.
Mars must have had higher atmospheric pressure as well as stronger greenhouse effect than Mars today which is responsible for the presence of water in liquid form on its surface but when the disturbance or change occurs in the atmospheric pressure as well as greenhouse effect of the Mars planet.
The water that was present on the surface vaporized and removed from the planet so we can conclude that higher atmospheric pressure and stronger greenhouse effect leads to the presence of water on the surface of Mars planet.
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In a research, the independent variable is the one which causes a change in the dependent variable. In this case, the nurse visit in hoped to cause reduction of doctor visits. That means the doctor visit is dependent variable and nurse visit will be the independent variable<span>.</span>