I believe you're talking about a population.
A I believe, hope it helps.
Well first of all...we require on each other.Pants give us oxygen and we give them carbon dioxide.Mushrooms helps in pizza.Another thing they have in common is that they need air,water and food etc.Third they all have a growth sprout.Finally....they were created by God.And also they've always been alive.
The answer is B. Periosteum
