If a country's rate of natural increase has declined, then the doubling time for its population has:
a) been reduced to zero.
b) decreased.
c) increased.
d) remained the same.

the answer is not negative reinforcement.

explanation:

wow this is going to be a long one

cats shouldn't be kept inside their whole life they should be out in nature in the fresh air but because of our technology advances it has become unsafe for our furry friend to be outside in the city's, because they could be hit by vehicles. in city's yes i agree being inside isn't the worse thing, but if you live somewhere rural you should let your cats outside, yes some animals hunt cats but i don't think cats should be kept inside confined to such a small space.

btw this is my opinion