A conditioned stimulus when paired with a bell. When the bell was rang food was presented. So upon hearing the bell the dog would salivate because he knew simply put food would then follow. This became known as classical conditioning.
No i don't think so i have not heard any one say that there is life anywhere else
The answer would be D) The growing population is taxing Earth’s resources which could lead to the extinction of many species (I just got this right)
<span>Carbon dioxide is essential for photosynthesis.</span>
