Which of the following must occur for speciation to happen?

Which statement describes john tuzo wilson’s contribution to the theory of plate tectonics?

How have high taxes on tobacco products impacted the number of people who use them? a. the number of tobacco users has increased. b. the number of tobacco users has decreased. c. the number of tobacco users has not changed. d. the number of adolescent tobacco users decreased, while the number of adult users increased

In each transformation of energy , some energy what?