yes
no, but it does increase the population limit.
The population limit per civilization can be set prior to the beginning of the game. The maximum limit is 200 units per civilization, unless you are the Goths which gives a +10 unit cap Generally in Scenarios, the limit is 75 units.
No
Build more houses to increase your population, and build more community buildings to raise your population limit (and if necessary buy more land).
fack u
No
For spending increase my credit limit
no because of the limited factors that the food and other thing might limit the growth of the bear population.
Which part of a Cardinal's niche helps limit the size of the sunflower population in it's ecosystem? c. Eating Seeds apex
The limit cannot be edited by any official (microsoft-provided) way, but you can find apps to modify it using google for example. Many of them are here: http://aoe.heavengames.com/downsnew/dwnutils.shtml.
It does not have a limit. It just goes on and on until you get sick of it...
Birth Control is what is most likely to limit human population growth.