some early fossils suggest as long ago as 400-450 million years ago. There is of course some debate over the specifics, however nonetheless.... a long long time.
No. Sharks appeared on earth long before the first dinosaurs did.
since right after a sharks came into being
around 400 million years
Sharks have been around even before dinosaurs have. Scientists really dont know when but, they do know is that they are the longest living creatures in time.
Whale sharks are the largest living species of fish: They can be over 10 metres long and weigh more than 20 tonnes.
The Earth has been habitable for living organisms for about 3.5 billion years.
Not long unless they are freshwater sharks
No, but some scientists do study how the earth, the solar system and the universe came to be based on observations of the universe today and in the past and our understanding of the "laws of physics."
tiger sharks teeth are about 3inches long
18 million
10MIN
about 15 to 20 years and they mate about 3 times every few months.