Eben rolls two standard number cubes 36 times. predict how many times he will roll a sum of 4.

Lets make a list
assuming they have 2 cubes with 1-6 on them
combos are
1,1
1,2
1,3
1,4
1,5
1,6
2,1
2,2
2,3
2,4
2,5 
2,6
3,1
3,2
3,3
3,4
3,5
3,6
4,1
4,2
4,3
4,4
4,5
4,6
5,1
5,2
5,3
5,4
5,5
5,6
6,1
6,2
6,3
6,4
6,5
6,6

out of all 36 times, only 3 times did the sum equal 4
3 times he will roll a 4 

ALL CREDIT GOES TO ANOTHER ANSWER THIS IS NOT MINE!

The answer is biodiversity resulting from new ancestors.