Did dinosaurs have 4chambered hearts or 3 chambered. And why?

Question

Paleontologist have considered that dinosaurs must have had a 4-chambered heart that supported a dual circulatory system similar to that of birds and mammals, rather than the 3-chambered heart of non bird reptiles.

Answer 1

A fossil evidence proved that dinosaurs had 4-chambered heart. Check this link to read WHY and other details.....

http://answersingenesis.org/docs2/4285ne...

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A  fossil skeleton reported to be 66 million year old was found in South Dakota, USA. Researches revealed that dinosaurs are warm blooded  animals with 4 chambered heart and a single aorta.

Get more from this link beneath...

http://www.downtoearth.org.in/full6.asp?...

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Wiki has pretty good explanation about cardiovascular system of mentioned species

http://en.wikipedia.org/wiki/Warm-bloode...

And some details in question answer form.....click to have a glance at them.

http://www.naturalsciences.org/dinoheart...