Functional extinction means that there are not enough live animals (or animal protoplasm) of a certain species for the species to breed and survive.
I'm not sure if you mean extinction, or extension, but there you have both.
No longer in existence
If you mean on the brink of extinction then no.
It means complete destruction; annihilation
The characters affect.
New species that form right after a mass extinction
The absence of any reinforcement following a behavior. Usually extinction occurs in situations where positive reinforcement was formerly applied.
functional design specification
(of flora or fauna) in imminent danger of extinction; "an endangered species"
limited amount and close to extinction
No, mule deer are not threatened by extinction, if that's what you mean by are mule threatened. If you mean are mule deer threatened by other animals, then yes, they are threatened by other animals. They are threatened by their predators, such as cougars and coyotes, but not by extinction.
the answer to the question is extinction