Thursday, 1 March 2018

Evolving life on Earth


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CHANGE IS THE RULE OF NATURE..





Image result for dinosaursHuman are descending from the bacteria that were Earth's earliest life forms. Evolution is the process of how life form change over the course of generation. when an animal develops a successful new feature- such as the ability to passed down to future generations.


*WHY DID DINOSAURS BECOME EXTINCT ?
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The dinosaurs died out at the end of the Cretaceous period, 6.5 million years ago. many experts believe that this happened when an enormous asteriod struck the Earth. The impact threw up a huge cloud of dust, which blocked out the sunlight for a long time. Land plants died so the dinosaurs starved to death

*WHY IS THE CAMBRIAN PERIOD IMPORTANT ?

Image result for cambrian periodBefore the Cambrian period, most living creatures were soft-bodied and left few fossils. During the Cambrian period, many creatures had hard parts, which were preserved as fossils in layers of rock - ready for scientists to study later!

Image result for first animal with backbone* WHAT WERE THE FIRST ANIMALS WITH BACKBONES ?

Jawless fish were the first animals with backbones, They appered during the Ordovician period. Fish with skeletons of cartilage, such as sharks, first appeared in the Devonian period.

Image result for first mammals* WHEN DID MAMMALS FIRST APPEAR ?

Mammals lived on earth from at least the start of the jurassic period . But they did not become common until after the extinction of the dinosaurs.

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HOMINID
THIS HOMINIDS SKULL  IS OVER 3 MILLIONS YEARS OLD
* WHEN DID PEOPLE FIRST LIVE ON EARTH ?

Hominids ( ape-like creatures that walked upright) first appeared on earth over 4 million years ago. Modern humans appeared about 100,000 years ago.    

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HOMO NEANDERTHAKS
* WHO WERE THE NEANDERTHALS ?

Neanderthals were relatives of modern humans that disappeared 24,000 years ago. Some scientists believe that they did not die out - they may have bred with modern humans and be amoung our ancestors!