B. Their needs change constantly
Many Theories, No Proof. Dinosaurs roamed the earth for 160 million years until their sudden demise some65.5 million years<span> ago, in an event now known as the Cretaceous-Tertiary, or K-T, extinction event
and
earth is </span><span>4.543 billion years old</span>
The correct answer is <span>unconditioned response.
An </span><span>unconditioned response is an automatic and natural response that occurs without any prior learning, as a result of an unconditioned stimulus. An example of an unconditioned response would be fear that an individual automatically feels after seeing a big spider. Another example of an unconditioned response would be a dog salivating at the sight and smell of food.</span>
