What is the dilemma with bringing a fish from the Twilight Zone to the surface

Which is an example of a population?

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.

Are the layers of rock above and below the coal older or younger?