Which number could be used as a conterexample to show that the conjecture "all even nunbers are divisible by 4" is false? 24
8
12
10

10

Explanation:

If you can't divide the number by 4, then it isn't divisible by 4. Try to divide 24, 8, 12, and 10 by 4. If your result isn't a whole number (like 2.4), then it isn't divisible by 4.

they use tree rings to figure out weather patters.