7 pens and 20 pencils because 28 divided by 4 = 7 and 80 divided by 4 = 20
Answer:
More than one independent variable being tested.
Step-by-step explanation:
If a student wants to figure out if ONLY salt affects the growth of seeds, the student shouldn't change the amount of sunlight being received.
The answer is C because it is at the first of four intervals between 0 and 1
