Four half lives have passed because the amount is cut in half each time
There is no question here
Answer: sodium-11 iron-26 sulfur-16
Explanation:
Answer:
Yes, it will.
Explanation:
The friction of the surface will tug at the book and lower it's velocity, causing it to slow down.
The polar bear lives in a cold artic tundra, whereas butterflys live in sunny tropical areas, they are different because the locations and tempuratures are different.