How are animal populations counted?

Eristics do scientists use to distinguish between organisms in different kingdoms

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

Which best describes a gene? a. a sister chromatid b. a chromosome c. a tetrad d. a piece of a chromosome