Alexis uses cocaine, which activates her sympathetic nervous system. Expecting her dealer, her hand shake in her heart pounds when she hears a knock on the door. Which alternative below correctly identify as the neutral stimulus, the CS, or the UCS?

Which of the following is an example of competition a. the leaves of a tree prevent a small shrub from getting sunlight. three species of birds feed a different heights in the same tree. b. three species of birds feed at different heights in the same tree c. zebra and giraffe’s feed on different grassland plants d. cats living in two different homes eat the same brand of cat food.