Scientists know that dinosaurs laid eggs because

As far as we know, all dinosaurs reproduced by laying eggs, as do most other sauropsids (reptiles). It is very difficult to determine what species of dinosaur laid the eggs that have been discovered, because only a few dinosaur embryos have been found inside the fossil eggs.

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it was hard to find out what dinosouras laid eggs. eggs that have been discovered, because only a few dinosaur embryos have been found inside the fossil eggs.

Explanation:

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