Recall that an up quark (u) has a charge of +2/3 and a down quark ...

[kaid0807]

Recall that an up quark (u) has a charge of +2/3 and a down quark (d) has a charge of -1/3. Which of the following quark compositions describes a proton?
 
  A) uuu
  B) uud
  C) udd
  D) uuudd

Question 2

The first multicellular organism appears around
 
  A) 542 million years ago
  B) 1.2 billion years ago
  C) 65 million years ago
  D) 3.5 billion years ago

[jasonq]

Answer to Question 1

B

Answer to Question 2

B

[kaid0807]

Thanks for the timely response, appreciate it

[miss.ashley]

Wow, this really help