What is the purpose for whales singing?

The large ground finch obtains food by cracking seeds. what is its short, strong beak an example? a) tendency toward perfection b) adaptation of a species over time c) selective use and disuse of an organ over time d) scarcity of recourses

In what layer of the sun is energy transfers between atoms

Aboy jumps into a cold swimming pool and his body tempature goes down hus muscles ,blood vessels