At the root of the tree of life A) is the common ancestor of ...

[audragclark]

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

[adf223]

Answer to Question 1

A

Answer to Question 2

C

[audragclark]

Thanks for the timely response, appreciate it

[daiying98]

Great answer, keep it coming