Why would a single celled organism evolve to be multi-celled?

Explain the significance of the increased cell specialization of the volvocine line

Which enzymes break down carbohydrates?

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