4.2 hours, do 315 miles / 75 miles per hour
Answer:
On the placement of hydrogen and helium in the periodic system
H1=1
He2=2
They can use them to find the age of fossils.
I believe its called mitosis. Mitosis is a type of cell division that results in two daughter cells each having the same number and kind of chromosomes as the parent nucleus, typical of ordinary tissue growth. Hope this helps:)
The answer is B
Vaporization
