Here's why:
* Genetic differences: While humans and apes share a common ancestor, we have diverged significantly over millions of years. Our genetic makeup is different enough to prevent fertilization.
* Chromosomal differences: Humans have 46 chromosomes, while apes like chimpanzees have 48. This difference in chromosome number makes it impossible for their sperm and eggs to combine successfully.
* Reproductive incompatibility: Even if fertilization somehow occurred, the resulting embryo would be genetically incompatible with the human mother's body and would likely not develop properly.
It's important to remember that cross-species breeding is extremely rare in nature and generally not possible due to significant biological differences.