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I'm not quite sure, but my guess is that because some fossils or bones were broken or in the shape of an animal or something, they couldn't tell with the naked eye. It also took years for them to view the cells or anything that might give them clues with microscopes.
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∙ 12y ago
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What was James Kirkland's theory on how dinosaurs became extinct?
Paleontologist James Kirkland was one of the first scientists to theorize that the dinosaurs became extinct because of an asteroid that slammed into the earth. It didn't take long for other scientists to come to the same conclusion and the theory is now widely accepted.
How long did it take for dinosaurs to extinct?
They aren't extict. Birds are dinosaurs.
What observations did scientists make about dinosaurs that made them think dinosaurs were not l izards?
-Dinosaurs have thin/hollow bones, like birds. -Many dinosaurs take care of their young. -Dinosaurs can walk upright (some, at least). -The hip structure of dinosaurs is dissimilar to that of a lizard.
How long does it take a scientists to find a disease?
i think its every day
When did the Bermuda Triangle legend began?
scientists think that the bermuda triangle began when dinosaurs were there they think that aliens used it to take the things present in the triangle to there own planet to research .
How long did it take scientists to figure out everything we know about atoms?
2400 years
How long will it take to name every cell in the world?
As long as it takes to identify them all and define their specific function.
How long does it take to get to mars and back to earth?
About 2 years. Scientists say it may take 1 year to get to Mars
How long did it take the two scientists to study the cell after Antony van Leeuwenhoek?
A few years
What can scientists learn from mummies today?
How long ago it was made or how long it has been dead, how it died, how long it lived, etc. it can also show who it was and or what gender.
Can you write a sentence using the word 'why'?
Yes. Why did you take the cookie from the cookie jar?
How long does it take one water molecule to complete one cycle?
Scientists estimate that it can take a single water molecule as long as 4000 years to complete one cycle.
