6. What transforms the spinal cord in vertebratesanimals.
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The spine evolved about 500 million years ago. The Cambrian explosion responsible for upright walking began when the ocean's creatures developed vertebrae. They didn't have a spine yet, though, only “notochords”, which are made of a material similar to cartilage.
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A car travels a distance 20km on a straight road in two hours and then returns to the starting point in three hours. Its average velocity is
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cvbllhduA car travels a distance 20km on a straight road in two hours and then returns to the starting point in three hours. Its average velocity is
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