Vertebrates have a back bone. They have living endoskeleton, pharnyx and efficient respiration, advanced nervous system, and paried limbs.
C seems like the correct answer
Protist<span> manufacture their own energy by photosynthesis (using sunlight)</span>
<span />
A cold front does count as weather, if you're looking for more info on cold fronts and warm fronts visit the site below.
http://www.weatherquestions.com/What_are_fronts.htm
A (m) is likely to be smallest
