<span>A) they prevent blood from flowing backwards
</span>
<span>the answer is c. segmentation </span><span />
Carbon dioxide, ammonia and methane
Answer:
i dont know but i think both
Explanation:
hope i helped
Question: Which describes the variable that is changed to test the prediction?
A)dependent
B)experimental
C)control
D)independent
Answer: The variable that describes the changed to test the prediction is "independent."
Explanation:
The independent variable is the factor which gets changed or can be controlled to see its effect over the experiment. Only the independent variable responds to the changes. The independent variable will be shown on the x- axis. The age and time are two different independent variable. These two factors are independent of everything else. The variable which can be easily manipulated during the experiment is called as the independent variable.
