Answer:
The independent variable is "controlled" or held constant in the control group.
Explanation:
The correct answer is B, I know this because none of the other answers are even reasonable. For example-
A is wrong because the size of elephant tusk has not changed over time, elephant tusk just grow...
C is wrong because it makes no sense to hunt elephants with no tusk :/
D is completely wrong because tusk have nothing to do with reproduction, those are two completely separate bodily functions.........
Answer:
B. because science only uses facts that are proven 100% true through the use of variable