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en.wikipedia.org/wiki/Sympatric_speciation

Sympatric speciation is the process through which new species evolve from a single ancestral ... Under the mechanism of natural selection, therefore, homozygosity would be favoured over heterozygosity, eventually leading to speciation. .... that speciation cannot occur without geographic and thus reproductive, isolation.

www.quora.com/Can-natural-selection-occur-without-competition-evolution-and-variation

If natural selection occurs, evolution is happening. ... then there you cannot say that any evolution occured when it died, because you have no population left that  ...

www.answers.com/Q/Why_could_natural_selection_not_occur_without_genetic_variation_in_a_species

Natural selection is the selection of a certain trait as more favourable - meaning those individuals are more likely to reproduce.

www.answers.com/Q/Natural_selection_cannot_occur_without_what

Variations within a population. Variations mean traits that only certain individuals have that give the individual a greater or lesser chance of reproducing.

necsi.edu/projects/evolution/evolution/5parts/evolution_5parts.html

Darwin's Theory of Natural Selection has been divided into five parts to explain ... none would be better suited than any other, and selection could not occur.

questgarden.com/127/14/1/110526073851/files/Nat.SelectionWKST.docx

Natural Selection Words: Write the letter of the correct definition in the space provided on the left. Evidence of ... Natural selection could not occur without (11)  ...

answersingenesis.org/natural-selection/natural-selection-vs-evolution

Mar 8, 2007 ... There is none; and I cannot accept the theory that I teach to my students each year. Let me ..... No more long-beaked woodpeckers would be produced without a ... of years, to occur as a result of mutation and natural selection.

www.flashcardmachine.com/biology-chapter13.html

Oct 30, 2013 ... that evolution occurs only in short periods of time ... Natural selection could NOT occur without ... According to Darwin, evolution occurs.

marinebio.org/oceans/conservation/moyle/ch5

Four general conditions necessary for natural selection to occur are: A. More organisms are born ... If any of these is not true, then natural selection cannot occur.

evolution.berkeley.edu/evolibrary/misconceptions_teacherfaq.php

Because evolution is slow, humans cannot influence it. ... First, as described in a misconception below, natural selection does not produce organisms ... Genetic drift occurs because, due to chance, the individuals that reproduce may not .... wiped out the entire prey population, leaving the predators without a food source) .