Most naturally occurring selective pressures do not eliminate reproduction by the affected individuals. Instead, their reproductive capacity is reduced by a small proportion. How would your results differ if there was only 20% negative selection pressure rather then 100%?

The result would differ in the sense that the reproductive success would not decrease at the same rate at 20% as it would at 100%. At 20% it would decrease faster.

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more words for this could be abiotic and biotic

abiotic: living organisms within an ecosystem

biotic: non-living organisms within an ecosystem