Answer: D - geographic isolation
Explanation:
Answer:inertia and gravity
Explanation:
The factors which keep the Earth revolving around the sun are the inertia and the gravity. These forces work together in order to keep the Earth and moon in their respective orbits.
Answer:
On this timeline, there are 10 years between each date on the timeline, therefore the interval is 10 years. You can also think of it as "We're counting by 10 years." What interval is being used on each timeline? The span of a timeline is the amount of time from the beginning to the end of the timeline.