The detail that best supports the authors claim that the Narwhal is best known for its tusk is (2) There are many legends about the tusk of the narwhal.
What does the passage tell us?
The given passage The Unicorn of the Sea Tells us about the Narwhal whales. The male Narwhals were known for their one long and sharp tooth which was known as the tusk.
This is considered to be the originating story of the unicorns.
Therefore, the statement that best supports the authors claim that the narwhal is best known for its tusk is that There are many legends about the task of the narwhal.
Hence, the correct option is (2).
Learn more about Reading Passages on https://brainly.com/question/12555695
#SPJ2