How have scientists studied dinosaurs if they are not around anymore

by digging up the bones

Explanation:

they had technology now to reconstruct what dinosaurs COULD have looked liked with skeletons they can figure out what diet the animals were by looking at the teeth like dogs with sharper teeth eats meat and animals with more flat teeth eats grass and everything

the bald eagle got 50 because everything gets 10% of what they consume and since 50 is ten % of 500 hundred that means the   grasshopper had to have consumed a plant with 5,000 calories of energy

a. decomposes use carbon from dead organisms as fuel for cellular respiration, returning carbon dioxide back into the atmosphere.