The helix 
intersects the curve 
at the point 
Find the angle of intersection.
Definitions:
Sympatric Speciation
Origin of new species in populations that overlap geographically.
Reproductive Isolation
A set of mechanisms that prevent different species from mating or ensure that any offspring produced are sterile.
Geographic Isolation
A mechanism of evolutionary separation where populations of a species are physically separated by geographic barriers leading to species divergence.
Natural Selection
The process by which organisms better adapted to their environment tend to survive and produce more offspring, a key mechanism of evolution.
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