What characteristic of the species level of organization distinguishes two similar organisms such as ducks and geese as different species?
Biology · High School · Mon Jan 18 2021
Answered on
Answer: Most evolutionary biologists distinguish one species from another based on reproductivity: members of different species either won't or can't mate with one another, or, if they do, the resulting offspring are often sterile, unviable, or suffer some other sort of reduced fitness.
They don't interbreed with each other so they are separate from each other; different species.