Question

review the claim and the two pieces of evidence.
by some measures, dolphins are more intelligent than humans.
evidence a: one measure of intelligence is the ability to recognize oneself in a mirror. a study revealed that dolphins recognize themselves when they are seven months old—even earlier than human babies do.
evidence b: research has long shown that dolphins are extremely intelligent. dolphins can learn and apply knowledge, understand challenging situations, think abstractly, solve problems, and feel emotions.
why is evidence a stronger than evidence b?
evidence b does not directly support the claim. it does not compare the intelligence of dolphins and humans.
evidence b is anecdotal. it is based on the opinions of a small group of people and may not reflect the views of experts.

Explanation:

Evidence A directly compares dolphin and human intelligence via mirror - self - recognition ability. Evidence B only states dolphins are intelligent without such a comparison, making it less relevant to the claim that dolphins are more intelligent than humans.

Answer:

Evidence A directly compares dolphin and human intelligence, while Evidence B only describes dolphin intelligence without comparison.