A car was invented to run on only water and nothing else so that the air pollution can be decreased because then no smoke would come out of the exhaust.
Relative Dating
GOOGLE DEFINITION BELOW
Relative dating is the science of determining the relative order of past events (i.e., the age of an object in comparison to another), without necessarily determining their absolute age, (i.e. estimated age).
I believe the answer would be C i'm not for-sure tho...<span />
Answer:
The purpose of the Panama Canal is to reduce the time it takes for ships to get from the Atlantic to the Pacific.