Where do most living things get the good they need for life

What is hydroelectric power produced by?

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.

How can we use spectral lines of light coming from the superclusters to identify which is receding from earth at the slowest rate.