How do you tell if physicalchange has occurred?
a. it cannot be reversed.
b. a new substance appears.
c. no new substance is produced.

Im inn a ! what"s the answer which of the following is one way creativity can scientists? by ensuring they follow the scientific method by increasing the amount of time it takes to complete scientific experiments by making sure they only try things that have already been proven by leading them to ask more questions about the natural world