as you can obviously see the bottom of a factor tree would be the curious numbers of 2,2,3,5
2 and 7.
5, 3, and 2.
3 and 7
2, 3 and 7 (in any order).
Their at the bottom of the tree because the hole point of a factor tree is to find the prime factorization of the number, so it would be at the bottom of the tree.
3 and 5
When the bottom branch is all prime numbers.
The bottom branch of a factor tree consists entirely of prime numbers.
11010, 112, 5, 11