Which field of ecology studies trends and fluctuations in the number of individuals of a particular species at a particular time and place as a result of birth and death rates

hi,

the answer is third world countries, take for instance china, they restricted each family with only one child,

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answer >   yes we do, women; have three holes, urethral opening(pee hole, vagina, and the women pee/girls pee out of the urethra like the men do; only they have a single opening to pee/ejaculate.   (sorry if i'm too forward with this, but this is for a biology class, isn't it? )

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answer; neuropathic pain;