10 points each answer and brainliest (picture shown)

The diagram below shows four positions of Earth around the sun.

In which of these positions will the Earth move the fastest?
Position A
Position B
Position C
Position D

What molecules will be best used to compare different species with the exact same sequence of amino acids? why would two species have the same protein even if the molecules in question is different? (hint: transcription to translation to protein).