The Earth rotates on its axis, which results in a 24 hour cycle of day and night. The Earth also revolves around the Sun, which results in the changing of the seasons over the course of a year. The existence of days, years, and seasons demonstrates that most natural events
A.
occur in patterns.
B.
can only be observed with microscopes.
C.
cannot be studied by science.
D.
are random and unpredictable.