help with biology questions?

Mel

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the human population experienced exponential growth after
a agriculture began
b plowing and irrigation began
c the bbonic plague began
d the industrial revolution began

the americans, europeans, and asians who settled in the islands of hawaii changed the isands by
a clearing vast areas for the growth of sugar cane
b using large amounts of water
c introducing nonative crop plants
d all of the above

the hot spot strategy seeks to protect species in danger of exintion due to
a captive breeding programs
b expanding national parks
c human activity
d all of the above

varitation in human skin color is an example of
a incomplete dominance
b independent assortment only
c dominance and segregation
d segregation only
 
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