The correct answer is FALSE.
A single-blind study is a study in which only the participants are not aware of their involvement with a reasearch study, but the researchers know about it.
The situation in which neither the researchers or the participants are aware of the existence of their participation in a study is called a double-blind study.
They also invented the wheel, a very important contribution.
Answer:
D. the value of all final goods and services produced within a country in a given year.
Explanation:
The answer is the earth’s tilt! The reason for this is that the earth tilts on it’s axis which points it toward or away from the sun-giving it more direct sunlight or more heat! Hope this helps and please give brainliest!❤️
