Natural Selection, unless you were born in a lab which would be unnatural/artificial, and not too likely with today's technology. (Maybe one day.)
The element starts off as 100%. half of 100% is 50% and half of 50% is 25%. the element has emitted 2 times the half life which is 10,000 x 2 = 20,000
the fossil bone is 20,000 years old
Answer:
The correct answer is option "C"
Explanation:
Since 2005, the vaccine has also been available as part of a combination vaccine called MMRV
