A: The hydrologic cycle.
Hope this helped :)
Answer:
Explanation:
Gravity is an attractive force that acts on every particle of matter in the universe. The strength of the attraction depends on distance and mass however. If they're close enough, two particles of cosmic dust will gravitate toward each other. Meanwhile, the gravitational force of a planet will pull on objects much farther away.
The plague was spread because of the poor hygeine back in that time
Answer: Use this link to find out the answer to your question - https://populationeducation.org/stage-1-demographic-transition-model/ (If you can't click it then just copy-paste it in a new tab)
Have a nice day ahead :) <3
