A reflex is an involuntary, pre-programmed, automatic motor response.
Common sense teaches that without this special sense our earliest ancestors could never have survived.
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.