hahah you don't know this? can't imagine being that dumb must suck.
B) cold to hot hope this helps
The answer is the Phloem. Food=Phloem
If the parents have black hair then all the kids would have black hair (a)
if one parent has blonde hair and the other has black hair then 2 kids would be blonde and 2 would have black hair (d)
if the parents have blonde hair then the kids would have blonde hair (c)