Answer:
Unconditioned stimulus.
Explanation:
Classical conditioning may be defined as a type of learning procedure in which the biological procedure is used to pair up with the previous nerve stimulus. This stimulus result in the response of an individual.
The Pavlov experiment with the dog explains the process of classical conditioning. The ringing of bell (conditioned stimulus) is paired with unconditioned stimulus (meat presentation).
Thus, the meat presentation is unconditioned stimulus.
Answer:
A. Transports nutrients to cells
Explanation:
The digestive system does not transport nutrients to cells, but it does do all of the other listed functions
I believe heterotrophs are organisms that get their energy by eating other organisms. These organisms are also called predators
Answer:
Charles Darwin was a naturalist from the 1800's. He developed the theory of natural selection which became the foundation of modern evolutionary studies. Natural selection is the survival and reproduction of individuals and how they adapt.
Answer:
A process of change in a population through genetic variation over time.