Since the half-life is 4.5 billion years, two half-lives would have elapsed after 9 billion years.
<span>If you start with 400 g, half decays during the first half-life, leaving 200 g. </span>
<span>During the second half-life, half of the 200 g decays, leaving 100 g.</span>
I think it should be none of those
Answer:
You could write about someone stealing something
Explanation:
And further explain the panic you felt and how the atmosphere changed
