<u>Answer:</u>
- approximately 5 half lives
- 28,650 years ago
<u>Explanation:</u>
<u>After 1 half life:</u>
50% gone, total gone = 50% and the amount that is left = 50%
<u>After 2 half lives:</u>
25% gone, total gone = 50 + 25 = 75% and the amount that is left = 25%
<u>After 3 half lives:</u>
12.5% gone, total gone = 87.5% and the amount that is left = 12.5%
<u>After 4 half lives:</u>
6.25% gone, total gone = 93.75% and the amount that is left = 6.25%
<u>After 5 half lives: </u>
3.125% gone, total gone = 96.875% and the amount that is left = 3.125%
Therefore, we can say that nearly 5 half-lives have occurred and the animal died approximately (5 x 5730 = ) 28,650 years ago.