Why did the constitution provide that the total number of seats in the house of representatives should be apportioned among the states based on population, rather than being set at a fixed number?

so everyone could be represented equal

ex you can have 5 porple repreesenting all of new york

worldwide, 780 million people do not have access to an improved water source. an estimated 2.5 billion people lack access to improved sanitation (more than 35% of the world's population)