Answer:
yes dinosaurs were there
Explanation:
some fossils and skeleton models were found as proof
Most reasonable answer is the swallowable camera one. mris and cat scans were invented in the 70s and the rest of the answers are around the 1800s or before.
It is the circulatory system and respiratory system.
C is your answer
The table keeps track of all your data
Go to www.essaybot.com it creates an essay for you with whatever topic you need help in