Question

the biological species concept defines a species as: organisms that look alike organisms that share common ancestors organisms that can interbreed and produce fertile offspring organisms with similar ecological roles

Explanation:

The Biological Species Concept focuses on reproductive isolation. Organisms that can interbreed and produce fertile offspring are considered the same species. Physical appearance (look - alike) can be misleading as different species might have similar looks (convergent evolution). Sharing common ancestors is more related to phylogenetic concepts. Similar ecological roles are part of the ecological species concept.

Answer:

Organisms that can interbreed and produce fertile offspring