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.
They aren't extict. Birds are dinosaurs.
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.
-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.
i think its every day
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 .
As long as it takes to identify them all and define their specific function.
About 2 years. Scientists say it may take 1 year to get to Mars
A few years
Yes. Why did you take the cookie from the cookie jar?
A crater did not take out the dinosaurs..... But the crater caused by the asteroid that took out the dinosaurs is about 180 km (110 miles) in diameter.
scientists are still looking at it but it really depends on when the daisy has grown
What dinosaurs? They came in VERY different sizes.