They evolved together.
Let's say there is a certain species where the offspring are born and left to fend for themselves.
Let's say that one of the mothers in that species has it in her genetic makeup to be a little bit more defensive about her offspring. Those offspring will have a greater chance of survival and then that species will have a greater percentage of individuals with that trait. With each generation, those with even more protective mothers have a higher chance of survival and protectivenes then becomes even more common. After many generations, protectiveness becomes, far and away, the most common trait.
In Nature, there are two main reproductive strategies: Small number of offspring with protective mothers or uncaring mothers that produce large number of offspring to make up for those that die.
Does not apply.
No human mother could exist without first being a human infant.
No human infant could exist without having a human mother care for it for years after birth.
See the dilemna?
Why do you try? Do you fancy yourself a cult deprogrammer?
"They evolved together."
Huh? Or, to put it more succinctly, Huh?