The bases of the two dna chains are linked in the middle of the molecule by bonds.

Although the two theories differ on the evolutionary path of dinosaurs, they agree that

What is the difference between an igneous, sedimentary and metamorphic rock

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