Belle is studying a population of moose on an island and the shape of the population growth curve is sigmoid, with population size plotted on the vertical axis and time plotted on the horizontal axis. Likely what accounts for the flattening of the curve at the top?
a) Aging of animals so they no longer reproduce.
b) Shortage of resources, raising the death rate and lowering the birth rate.
c) Exponential growth.
d) Density suddenly lowered.
e) Allelopathy.|||d) Density suddenly lowered|||b. Shortage of resources and the like will cause the growth curve to flatten.
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