Working out: 6.25% = 4 half lives (20x4=80ma) 80ma is how old the rock is
If this is for u just imagine that u are in a safe place like the low water and if u want to stay in one place just put u arms out and kick u legs. hope this helped.
Good deeds will be rewarded
Answer:
D
Explanation:
"Jeff, the famous author and inventor, arrived late at the lecture hall for his public appearance."
The famous author and inventor is adding details on Jeff, so commas have to surround it.
