A student creates a simplified model for the earth's orbit around the sun. the teacher asks the student to refine the model to include the two most important concepts regarding the orbit of the earth around the sun. which modifications should the student make? select all answers that apply. a) the student should indicate that inertia keeps the planet in motion once it is in motion. b) the student's model should indicate that the earth has a moon that also orbit the planet the student's model should indicate that the earth's position is not tilted as it orbits. d) the student' model should indicate that a gravitational attraction occurs between the sun and the earth. e the student's model should indicate that the earth's movement speeds up during the second half of the orbit.
