what characteristic of the species level of organization distinguishes two similar organisms such as ducks and geese as different species?
the way they live, how they act, where they migrate to etc. their lifestyle and their behavior is what makes similar organisms different species.
Answer;
-They don't interbreed with each other so they are separate from each other; they are of different species.
Explanation;
-Species are a group of closely related organisms that are very similar to each other and are usually capable of interbreeding and producing fertile offspring.
-Interbreeding is key to the biological species concept, which defines a species as members of populations that can interbreed with each other to produce viable offspring.