Answer: Convection
Explanation: Cold water sinks because it is more dense than warm water.
Warm water rises because it is less dense than cold water.
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.
<em>2nd is true...3rd is false...5th is true...sorry can't guide u more than this</em><em>.</em>
<em>hope</em><em> </em><em>it</em><em> </em><em>helps</em>
Well, the reson they do this is too look at the pupeles and if they dialate when the light hits there eye then they have not suffered trama to the brain but sence she did see trama then the eyes did not dialate which tells her there is trama in the brain, hope this helps!
