Answer:
I cannot see the choices for no. 10, so I'll answer no. 8 and no. 9.
8. a. keep the Earth from tilting on its axis
9. c. an Earth-centered to a sun-centered model
Step-by-step explanation:
8. The tilting of the Earth on its axis (23.5 degrees) is greatly related to the weather/seasons in different countries. It also affects the amount of daylight that a specific area receives. Keeping the Earth from tilting on its axis would allow your area to receive the same length of sunlight because not tilting at all leads to fewer number of variations.
9. The Earth was thought to be the center of the universe in accordance to the Ptolemaic system. However, this changed through "Heliocentrism," which states that the "sun" is the center of the solar system.