Why do giraffes have long necks? Answers to 25 animal evolution questions – Gwinnettdailypost.com

About a billion years after the Earth formed, the first signs of life emerged. These were just single-celled microbes, but through billions of years of evolution, scientists think that one of these organisms became a common ancestor to all life, including animals.

Evolution has shaped life ever since it first emerged, progressing for more than 2 billion years before the first animals evolved from their primal ancestors. Since then, the animal kingdom has adapted to fill niches nearly everywhere on the planet, from the sea to subterranean tunnels.

Evolution encompasses the changes species undergo over long time periods. It describes how a species’ gene pool can gradually change over time, thanks to random DNA mutations or sexual reproduction introducing new genetic combinations. Traits can emerge that help individuals survive to reproduce and pass on their genes to future generations.

Nineteenth-century naturalist Charles Darwin used natural selection, or “survival of the fittest,” to describe a major aspect of evolution. According to this theory, individuals with traits better suited to the environment are more likely to survive to pass on their traits to offspring. For example, if there are a few beetles with superior camouflage in a group with other beetles that stand out, the camouflaging beetles will have a higher chance of surviving and reproducing. Over many generations, the species will adapt to their surroundings as more beetles with that camouflage trait make up the population.

Evolution is driven by interactions between genetics and nature, and the Earth’s rock layers preserve
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