Whats the difference between biological species concept and morphological species concept

Explanation:

The biological species concept is the idea that in order to qualify as the same species, individuals must produce fertile offspring with each other.

Example: A horse and donkey can create a mule, but mules can not mate with other mules, making horses and donkeys different species under this concept.

The morphological species concept means that individuals that share similar physical appearance are the same species regardless of whether or not they can reproduce together.

Example: Bacteria reproduce asexually so the biological species concept can't really apply, so this concept categorizes species of bacteria based on how they look.