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<span>There wasn't many vaccinations back in the day and medicine slowly developed through years passing by. Also eras such as the Black plague and others really helped develop medicines and vaccinations moving forward for people to use.
Hope this helps.</span><span />
Answer:
Human population changes due to population dynamics as birth, death and migration.
Explanation:
- The shift in the population of the US occurring during the year 2000 to 2004 as a result of the movement from the northeast, midwestern regions to the north and south west and to the southeast.
- Places like California and NY were losing population due to the high cost of living. States like Michigan had high unemployment rates. Other states gained population due to the lower living costs and availability of jobs.
Rainfall and temperature can affect the rate in which rocks weather. High temperatures and greater rainfall increase the rate of chemical weathering. Minerals in a rock buried in soil will therefore break down more rapidly than minerals in a rock that is exposed to air.
hope this helps!! :)
