Answer:
The main reason is that very young calves are more noticeable to predators when mixed with older calves from the previous year
Explanation:
We don't really understand what "ball really is life" means, but
judging by the overall group of questions you posted today, one
can be pretty sure that this one is equally meaningless.
Soap bubbles and balloons are also spheres, but have no influence
on the nature of life.
The electric field generated by a proton is a radial field, so we would see the field lines going radially from the proton toward every direction. I've attached a picture representing the electric field generated by a positive charge, such as a proton, and we can see the field lines going radially from the charge toward every direction.