Rise of life

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What was the rise of life
the rise of life was when life first began on earth and steadily began to expand and evolve. it is a very complicated subject and many people understand it. We are not sure how life on earth first evolved but have a few, pretty good guesses. here are a few basic facts to start you off on this amazing story of life.


 * life began around 4 billion years ago. At first the earth was a lifeless, hostile, ball of lava and poisonous gas. it wasn't until a smaller planet (about the size of mars) crashed into earth that our moon was formed and seas and oceans were created. scientists think the first single-celled creatures came around at this time.


 * because the land was virtually impossible to live on, all life began in the ocean. single-celled creatures, during millions of years, evolved into sponges and worms that lived on the ocean floor.


 * much later on, athropods like scorpians evolved and hunted jawless fish along the sea floor. the development of the working eye definetley sped up life's race for survival.


 * Later, jawed fish with backbones evolved and mushroomed into bigger animals like sharks. as the land became more habitable, the bony fish gradually developed legs and crawled out of the water as amphibians.


 * millions and millions of years later, the amphibians evovled into reptiles. the reptiles had an advantage of being able to constantly live on land and not return to the water. because of this, they evolved into bigger sizes, gained the saber tooth and inhabited all the earth. but soon they faced the biggest extinction ever on earth, killing off almost 90% of all life on earth.


 * but a few hardy survivors held on to life by burrowing into the earth. they were small but soon mushroomed into massive sizes and gained dominace again.


 * later on, small reptiles evovled to have legs positioned beneath their bodies so they could walk on two legs. welcome to the age of the DINOSAURS!

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