Does environmental pressure change everyday?
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How does environmental pressure affect natural selection?
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Jeremy Teman, Former Evolutionary Biology SI.
Answered Apr 14, 2016 · Author has 130 answers and 391.4k answer views
Without environmental pressure, natural selection doesn't happen.
With respect to a trait of a given population, the necessary and sufficient conditions for natural selection to occur are i) variability, ii) heritability iii) differential fitness by means of selective pressure.
A population of organisms lives in an environment. Any selective pressure is an environmental pressure. There are biotic and abiotic pressures.
Biotic pressures are things like predation, pathogens, or anything that involves interacting with other life.
An example of abiotic pressure would be temperature. Some organisms within the population may have slight advantages over another at being able to withstand extremes. So they have increased chance of survival and reproduction. Hence, they are more likely to be "selected".
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Did Denisovan man interbreed with the humans?
DNA analysis of the Denisovan species shows they mingled with humans at different times.
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5 ANSWERS

Jeremy Teman, Former Evolutionary Biology SI.
Answered Apr 14, 2016 · Author has 130 answers and 391.4k answer views
Without environmental pressure, natural selection doesn't happen.
With respect to a trait of a given population, the necessary and sufficient conditions for natural selection to occur are i) variability, ii) heritability iii) differential fitness by means of selective pressure.
A population of organisms lives in an environment. Any selective pressure is an environmental pressure. There are biotic and abiotic pressures.
Biotic pressures are things like predation, pathogens, or anything that involves interacting with other life.
An example of abiotic pressure would be temperature. Some organisms within the population may have slight advantages over another at being able to withstand extremes. So they have increased chance of survival and reproduction. Hence, they are more likely to be "selected".
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Yess but not usually noticable it is..
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