Answer:
4. p.complement system c.saliva b.sneezing
They feed by filtering feeding they feed on tiny organic material which is filtered through them
There would be increase in oxytocin in one's cerebrospinal fluid in the brain causing a major role in the mother's behavior. Breastfeeding would release the oxytocin from the mother's brain. It allows one's baby to get milk from the breasts causing one's uterus to return back to it's normal size after birth. It also nourishes love, nurture and bond between the mother and child.
The answer is because biology is easy and they're known around the world.
