Most of the worldwide human population is growing exponentially because?
a. human populations have not reached there exponential curve
b. human populations have not yet completed the demographic transition
c. human populations do not conform to the logistic model
d. science and technology have made it possible

Most of the worldwide human population is growing exponentially because B. Human populations have not yet completed the demographic transition.

It should the exponential growth means that the population is just experiencing the first stage of the demographic transition.

Most of the worldwide human population is not growing exponentially due to science and technology.  The fact that human populations have not yet completed the demographic transition is the main reason for the exponential growth.

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d.  

there was a variety of food available on island x, but there were only large seeds and nuts on island y.