a control helps to increase the reliability of the results. it allows a scientist to compare it to other group(s) in an experiment. if a scientist notices a significant different btwn the control and the other groups, he can logically conclude that the independent variable has an impact on the dependent variable.
a variable is any factor, trait or condition that can exist in differing amounts or types. there are usually three tpes of variables in experiments: the independent, dependent and contolled. the independent variable variable is the one that is changed by the scientists to figure it's affect on something.
Answer:
We need the directions. Once provided I will then edit this.
Explanation:
The answer is urticaria (also known as hives).
Gravity is one reason but also it depends in the speed, if the wave is fast, it will go higher and then bend. hope i helped :D
Your answer is D
Biology is my best subject
