Question

In general size of the cells has no relationship to the size of the organisms how do the notion in a rat and a giraffe compare in their length

Answer 1

giraffe has more cells compared to rats

Answer 2

The evolutionary changes occurred in giraffe, they developed long necks and rest of its body also became massive. So as the nerve cells are also long.This made the giraffe to respond very slowly to the outside environment. In contrast, rats have very short nerve cells (neurons) ,their response to stimuli is so fast.Hence function of the cells related to their size