Question

what was the reason of dinosaur to be dead

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Answer 1

The exact nature of this catastrophic event is still open to scientific debate. Evidence suggests an asteroid impact was the main culprit. Volcanic eruptions that caused large-scale climate change may also have been involved, together with more gradual changes to Earth's climate that happened over millions of years.

Whatever the causes, the huge extinction that ended the age of the dinosaur left gaps in ecosystems around the world. These were subsequently filled by the only dinosaurs to survive - birds - and mammals, both of which went on to evolve rapidly.

Answer 2

Answer:

The reason is the astroids that comes from the space.

Explanation:

The astroids are very much heated that falls on the dinosaur and became the reason of his death.