EVOLUTION
THE ORIGIN OF LIFE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Sharks used to live on land.
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Sharks used to live in warmer waters than they do today.
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Sharks that lived in the past were similar to sharks that live today.
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Shark behavior used to be radically different than shark behavior today.
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Detailed explanation-1: -Once Steno proposed that fossils originally came from living things, he needed to explain how fossils ended up in the middle of rock. This led to Steno’s most significant contribution to geology. He suggested that all rock was originally formed as sediment was deposited from a fluid that covered the planet.
Detailed explanation-2: -Steno’s Law of Superposition Steno studied the cliffs and hills of Italy to find the answer. He proposed that all rocks and minerals were originally fluid. Floating on the surface of the planet long ago, they gradually settled out of the ocean and created horizontal layers, with new layers forming on top of older ones.
Detailed explanation-3: -Teeth fossilize through a process called permineralization. As water seeps through sediments over the teeth, it transports the minerals that are found in the sediment. These minerals fill in pore spaces in the tooth causing them to fossilize.
Detailed explanation-4: -In Paleontology Most people believed ‘tongue stones’ grew naturally within rock formations. Fabio Colonna had advanced a different theory in 1616, when he said the ‘tongue stones’ were actually the teeth of ancient sharks.