How Natural Selection Works American Museum of Natural History English English

How Natural Selection WorksYouTube↗ IA↗(long shot)
Science & Technology 7.4K views 98 likes 5 dislikes 14 May 2015

American Museum of Natural History 440K subscribers United States YouTube↗

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[MUSIC PLAYING]

>>JOHN SPARKS: A common thread through the whole exhibit

"Life at the Limits" is evolution, and specifically,

natural selection.

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>>MARK SIDDALL: Life on this planet

lives within a very thin region called the biosphere,

but it's amazing how variable that

is in terms of temperature, in terms of pressure,

in terms of different environments--

wet, dry, hot, cold.

The animals and plants that live in these places

didn't always live there, and those environments

>>SPARKS: Organisms within a population have variation,

and they pass down this information to their offspring.

If that information or those characteristics

provides an advantage to the offspring,

they're more likely to survive, and those

that are more likely to survive then

are more likely to reproduce.

Then that trait can spread through the population

and become established.

So you get things spreading through populations

that allow organisms to maybe move into a new environment

and differentiate.

Think of a cave fish.

They tend to lose their eyes.

They don't need them anymore.

They lose their pigment.

It's costly to produce pigment.

So they're specifically adapted to live

in a particular environment.

And that's why we see all these spectacular forms,

because over a long enough period of time,

these changes do spread through populations.

They confer an advantage, and you get all this diversity

that you'll see and you'll be exposed to in this exhibition.

[MUSIC PLAYING]

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