Answer:
A
Explanation:
I know this because I just took the test and got it right.
The blood carries carbon dioxide away from the cells
Dwayne Johnson, Also known a the Rock
Answer:
What percent of potassium-40 remains undecayed in a rock that is 3.9 billion years old? The 3.9 billion year old rock has undergone three half-lives (3.9 divided by 1.3 = 3). After 3 half-lives, 12.5% of the potassium-40 remains undecayed.
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Explanation:
