Answer:
A. Population
Explanation:
Because all these deal with is people so the answer is population.
The legend is that Newton discovered Gravity when he saw a falling apple while thinking about the forces of nature. Whatever really happened, Newton realized that some force must be acting on falling objects like apples because otherwise they would not start moving from rest.
Southeast Europe. ... In this area, thereare three main climates: humid continental, which is the climate that dominates most of Eastern Europe, as far north as Sweden and Finland; semiarid climate in Eastern Ukraine; and Mediterranean climate in Southern Bulgaria, Greece and Turkey.
Your answer would be D) Stromatolites. hope this helps :)))!