A fossil is something extraordinary that tells us about animals and plants that lived a very long time ago. Fossils can be the remains of living things, like bones or shells. They can even preserve soft tissues, giving us a glimpse into the cellular level of ancient organisms. ...
根据最后一段中 “Still, he said, documenting the extinction of this species from the fossil record is tricky- and it's impossible to rule out the possibility that pockets of G. blacki may have lingered in still- undiscovered caves for longer.(不过,他说,从化石记录中证实这个物种的灭绝是很...
A living fossil is a species that can still be found living on earth, but is very similar to other species found in the fossil record that evolved...Become a member and unlock all Study Answers Start today. Try it now Create an account Ask a question Our experts can answer your ...
When Darwin first proposed the theory of evolution, he recognized that gaps in the fossil record presented serious threats to his claim that all life came from the same distant ancestors. Technology was simply too limited at the time to even find, much less identify, fossils dating back more ...
Old Fossils Scientists have found what they think is probably the oldest fossil on Earth, a remnant of life from 3.7 billion years ago when Earth's skies were orange and its oceans green.In a newly melted part of Greenland, Australian scientists found the leftover structure from a community...
Relative dating is the process of comparing different layers of rock to order specific events. Relative dating doesn't give an exact age to a fossil...Become a member and unlock all Study Answers Start today. Try it now Create an account Ask a question Our experts can answer your tough...
Theyhad heard there was “a thick pile of ancient rocks" datingto about a billion years ago. So, Tang took some of theseancient rocks back to the lab at Virginia Tech. Tang wasreally excited" when he saw the algae fossil under themicroscope.Just like modern-day algae, P. antiquus has...
(i) Fossils : The remains and / or impressions of organisms that lived in the past. (a) The fossils that we find close to the surface are more recent than the one we find in deeper layers. (b) Dating fossils by detecting the ratio of different isotop
The fossil record of antlers is excellent, but hitherto comprehensive investigations basically considered external anatomy only and neglected histological information. Here, we review the conflicting hypotheses and (distinctive) underlying data as well as systematic consequences. Further, we present novel ...
While paleontologists have studied fossils for centuries, the science of mass extinction is relatively new. Radiometric dating, based on the natural radioactive decay of certain elements, like carbon, and other techniques revolutionized the ability to precisely determine the age of ancient rocks in the...