Final answer:
Africa is projected to grow the most by 2100, while Europe is expected to decline the most.
Step-by-step explanation:
The continent projected to grow the most by 2100 is Africa. It is expected to experience significant population growth due to factors such as high birth rates and improving healthcare. Africa's population is projected to almost double by 2100, which would make it the most populous continent in the world.
On the other hand, the continent expected to shrink the most by 2100 is Europe. It is projected to experience a decline in population primarily due to low birth rates and an aging population. Many European countries are facing challenges related to low fertility rates and decreasing population sizes.
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