Answer is A. A population becomes separated by environmental factors into two groups that do not reproduce with one another.
When a population of a species become geographically separated then gene flow between them stops. Over a period of time, the population may become genetically different in response to the natural selection due to different environments. Selection and genetic drift will act differently on these two separated populations. This will results into two separate species. This type of speciation is called allopatric speciation.
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Factor analysis is a collection of techniques employed to explore underlying latent variables or factors which influence the outcomes on a number of measured variables.
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electron, carbon, protein, mitochondria, neurons, mass of neuron, nervous system, brain, man
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Because Venus and Mercury are closer to the sun they are never visible at around midnight
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I've read about this in articles
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animals will use sound, colors, and stance. Another way would be by leaving their imprint or mark on their territory. For example a dog peeing on an area they used.
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