Why do different types of cells do different jobs even though they contain the same dna

What would be an example of hypothesis for goldfish respiration lab

The breakdown of food is accomplished by enzymes. a. physical b. chemical c. mechanical d. none of the above

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