What could lead to a change in a scientific theory

The organelle pictured is found in cells of and is theorized to have once been an independent organism.

Isotopes of the same element have differ in their

Which best describes this behavior? it is beneficial only to the males that do not fertilize eggs. it is beneficial only to the female workers that are not fertilized. it is beneficial to each one of the individual colony members. it is beneficial to the whole species, but not to all of the individual members.