I think verterbrates have a back bone others do not. I only THINK so.
The answer is A. - Prokatyotic cells lack a defined nucleus while eukaryotic cells do have one :) I loved learning about the cells in biology! But I noticed your question is worded a little differently so the nucleus would be the one thing a eukaryotic cell has that a prokatyotic cell does not...
Mitochondria produce ATP, energy that is vital in aerobic cells. Therefore, I believe this is why they can be considered as power plants.
That the stripes make the snails less camouflaged therefore they are more likely to be eaten.<span />
