500
Which sentence is NOT correctly written for a final draft?
a. Summer days bring direct sunlight to a hemisphere, while winter sun is not as direct.
b. In summer the hemisphere tilts toward the sun, and in winter it tilts away.
c. These changes occur, because of the movement of the earth: it orbits around the sun.
d. When one hemisphere is having summer, the other is having winter.
What is c. These changes occur, because of the movement of the earth: it orbits around the sun.