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Last week we quickly went over some of the evidence for evolution at the end of our notes. Scientists believe the earth is 4.6 billion years old and the first mammal dates to about 220 million years ago, flowering plants only evolved 130 million year ago, and modern humans evolved 150,000 years ago. Scientists have recently discovered that 4 - legged animals emerged earlier than thought. What types of evidence do scientists use to determine the age of organisms and when things first emerged on earth? What other sorts of evidence could help them determine relationships between organisms and species?
Monday, January 11, 2010
Evidence of Evolution
Last week we quickly went over some of the evidence for evolution at the end of our notes. Scientists believe the earth is 4.6 billion years old and the first mammal dates to about 220 million years ago, flowering plants only evolved 130 million year ago, and modern humans evolved 150,000 years ago. Scientists have recently discovered that 4 - legged animals emerged earlier than thought. What types of evidence do scientists use to determine the age of organisms and when things first emerged on earth? What other sorts of evidence could help them determine relationships between organisms and species?
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Scientist use different ways to figure out the age of organisms and when they first emerged on Earth. One way is through fossils, which are clues of evolution which are trapped in rock (ie. foot prints, skeletons...). One way to then figure out the time period is the use of carbon dating.
ReplyDeleteThe types of evidence i think scientists use to determine the age of organisms and when things first emerged on earth is by the fossil records scientists and museums have all over the world.
ReplyDeleteThe scientists look closely at the fossils and they study them to see how old they are and when they first emerged on earth. Other evidence i think could help them determine relationships between organisms and species is by looking at their time period and other things like that.
I thought that the article displayed crucial evidence and continually proving that we have much to learn about our earliest evolution from tetrapods, to dinosaurs, to mammals to eventually humans. The footprints they had found dated almost 7 million years before when they first expected 4 legged creatures to come on land. These animals were believed to lay their eggs on land in order to keep them away from predators in the water, but soon the animals adapted to the air just like a baby does when it first comes out of the womb. It took in fluid at first but learned to take in air through adaption or evolution. Scientists are not completely sure that only this piece of evidence will change their original views but it is a step in the right direction
ReplyDeleteTo determine the age of a fossilized substance, scientists often obtain information from deposits of sediment or other material found within or around the fossil. From that point, they might use a method called carbon dating which helps to tell the precise age of a substance. One thing that might help link ancient organisms to modern-day species are the type of environment that the fossil was found in. One thing that could help determine the relation of a fossilized footprint to a species or one ancient species to another could be the age of the fossils themselves.
ReplyDeleteI don't quite see how someone could prove that evolution is true because there really is no way to prove it other than going back in time. Yet, I do believe in evolution and that we evolved over time (150,000 years ago). Theirs really no way that scientist can prove the relationships between organisms and species because their really is no way to prove it other than (again) going back in time.
ReplyDelete---->Hayden 5th*********
This article explains how fossils can help tell archeologists the bone structure and physical features of animals today along with animals that are now extinct. Many fossils are put together to form the bone structures of animals before humans even existed! These animal remains are put up in museums for everyone around the world to see. I think fossil structures are very helpful in discovering the past of our ancestors.
ReplyDeleteDaniel M 6*