Answer:
It is a change from one form to another. Or unit to another
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.........
Saturated and liquid at room temperature i believe
Pure substance can be classified as or compounds?
Answer: elements
