Hearing is a mystery that nobody, not even evolutionary biologists, understands.
Without the right refractive power or eyeball diameter our earliest ancestors would have been as blind as bats.
Let’s look at some of the ways the body acquires the information it needs about its external and internal environment.
To be able to sit and read this paragraph, your body must perform several actions all at once.
I’ve already explained that the embryo is destined to become female unless chemicals swing into action to make it become a normal male.