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.
s would be secondary Explanation:
just cause
Answer: A) wastes
Explanation:
More people, more littering
Answer:
1 quarter of a million especially young men who have dependents to go into the forestry and flood prevention work.
