Question

Q13. The closest descendant of tyrannosaurus rex that still lives today is

Answer 1

The closest living relatives of Tyrannosaurus rex are birds such as chickens and ostriches, according to research published today in Science (and promptly reported in the New York Times)
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Answer 2

any of the reptile whose evolution by passage of time had taken place.
for example:- crocodile and komodoe dragon