Read the excerpt from "Marine Mammals."
Why does the author use classification to help guide
readers through this part of the text?
Marine mammals are classified into four different groups
cetaceans (whales, dolphins, and porpoises), pinnipeds
(seals, sea lions, and walruses), sirenians (manatees and
dugongs), and marine fissipeds (polar bears and sea
otters)
It helps the author define the term "marine mammals."
It helps the author identify types of marine mammals.
It helps the author describe what marine mammals look
like
"Marine Mammals,"
National Oceanic and Atmospheric Administration
It helps the reader visualize the types of marine
mammals.
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