Researchers often find it more challenging to train dolphins rather than dogs even though dolphins are smarter. one of the reasons for this difficulty is that dolphins have shared evolutionary heritage with humans than dogs, so they condition to stimuli that are different than what will affect dogs and humans.
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Explanation:

According to my research on studies conducted by anthropologists, I can say that based on the information provided within the question One of the reasons for this difficulty is that dolphins have less shared evolutionary heritage with humans than dogs. Wolfs and Dogs have always dealt with humans therefore they have evolved with lots of experience with humans as opposed to dolphins who haven't.

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explanation:

the sun shines white and black light to our planet. the white light has all the colors in it. in our upper atmosphere, we have dust particles and oxygen molecules. the white light meaning all of the colors in a rainbow shines through the upper levels of the atmopshere and the blue light scatters across the entire planet. that is why our sky is blue.