Without the greenhouse effect the earth would be than it is today.
a. warmer
b. drier
c. colder
d. wetter

Without the greenhouse effect the Earth would be colder than it is today. It is letter C. Greenhouse effect is a social/environmental/global problem where the gases from CFCs, carbons, etc accumulated to the earth’s stratosphere causing pollution and trapped heat.  Green house is one of the ways people could avoid greenhouse effect. In making your house green, that is making it plant-friendly, you will be breathing more oxygen, less carbon dioxide. Thus if there is no greenhouse effect, there is colder atmosphere since the heat is not trapped on the Earth’s atmosphere.

The answer is colder  you should study it more it's pretty interesting! :)

Answertraveling around a circular trackexplanation"traveling around a circular track" is the best answer as you could be traveling around a circular track at a constant speed. your velocity would therefore have the same magnitude but will always be constantly direction. since acceleration is the rate of change of velocity, the rate of change will only involve the direction of velocity and not the magnitude.wrong choices: "an object at rest" does not accelerate at all"increasing speed while traveling around a curve" means that the acceleration will not be constant due to only change in direction; it will be constant due to both magnitude and direction"an object in free fall" does not necessarily change direction