Author Question: At the root of the tree of life A) is the common ancestor of all life on Earth B) is the common ... (Read 153 times)

audragclark · **on:** Jul 27, 2018

At the root of the tree of life

A) is the common ancestor of all life on Earth
B) is the common ancestor of all mammals
C) are viruses
D) are human beings

Question 2

How many atoms fit across the period at the end of this sentence?

A) hundreds
B) thousands
C) millions
D) billions
E) more than you could count in a lifetime