It is A, sunlight. The variable is the type of light used, and the control is used to measure the effects of the variables, so since sunlight is the normal light, it is the control.
Answer:
Polar bears and black bears are part of the same family.
Explanation:
In the fist box is Oxygen builds up....
In the second is The Last ice age
And the last is the last answer.
Sorry for not typing the whole answer!
Hope i helped you :)
Answer:
cell
Explanation:
cell is the basic unit of life