What causes a species to evolve?

Change in an organism's environment forces the organism to adapt to fit the new environment, eventually causing it to evolve into a new species. Organisms become isolated as a result of environmental change. The cause of isolation can be gradual, like when mountains or deserts form, or continents split apart.

Furthermore, what type of animal has been around the longest?

Here the list of top 10 oldest animal species on Earth.

  • 7 Sturgeon – 200 million years old.
  • 6 Coelacanath – 360 million years old.
  • 5 Horseshoe Crab – 445 million years old.
  • 4 Nautilus – 500 million years old.
  • 3 Jelly Fish – 550 Million years old.
  • 2 Sponge – 580 million years old.
  • 1 Cyanobacteria – 2.8 billion years old.

How animals have evolved?

Compared to prokaryotic organisms such as bacteria, plants and animals have a relatively recent evolutionary origin. DNA evidence suggests that the first eukaryotes evolved from prokaryotes, between 2500 and 1000 million years ago. Like the plants, animals evolved in the sea.

Which animal is evolving the fastest?

"Living Dinosaur" Is Fastest-Evolving Animal. New Zealand's "living dinosaur," the tuatara, hasn't changed its look in millions of years. But the reptile is actually evolving faster than any other animal studied so far, new DNA analysis reveals.

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