K Keratin Keratin is the stiff substance that baleen, hooves, hair, horns, and fingernails are made of. In classification, a kingdom is the highest grouping of similar organisms. A knot is a unit of speed used on the water, and is defined as one nautical mile per hour. Krill Krill are tiny animals, euphasiids, that float in the oceans. They are shrimp-like crustaceans that are found in vast amounts in the cold waters of the Arctic and Antarctic Oceans.
Baleen whales eat krill that they sieve through their baleen.
Blue whales can eat about 4 tons of krill each day. The K-T extinction was the mass extinction that occurred 65 million years ago, at the boundary of the Cretaceous and Tertiary periods. As stated in our privacy policy , we fully respect your privacy and will not use your e-mail address for any purpose other than the newsletter subscription.