Life: Scientists have found signatures of life in rocks from 3.5 billion years ago. That means life
existed in a world with very low oxygen! What
is the evidence?

What do scientists need to look at before developing an argument

Which statement is true about the cell theory? a) it is well-supported by evidence. b) it is unchangeable and permanent.

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