Some worms eat at night (meaning they are nocturnal) and some worms eat during the day (meaning they are diurnal.) Most birds
eat only during the day, so they are only eating diurnal worms,
due to the fact that the nocturnal worms are burrowing during this
time. Each spring when the worms reproduce about 500 offspring
are born but only 100 of them live long enough to reproduce themselves.
EXPLAIN HOW NATURAL SELECTION COULD OCCUR. INCLUDE THE FOUR PRINCIPLES OF NATURAL SELECTION (Overproduction of offspring, adaptation, variation, and descent with modification)