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The external nares of sharks connect to the gills and are used for extracting oxygen from the water.

Which of the following is not a function of the notochord?

The melon is a fatty organ in odontocetes that is used for echolocation. It focuses sound in front of their heads.

The bones of penguins are heavier than those of flying birds (of comparable size). Penguins can afford the extra weight because the water supports their bodies. In addition, the extra weight helps them to dive underwater.

A patient with newly diagnosed type 2 diabetes mellitus asks the nurse what “type 2” means in relation to diabetes. The nurse explains to the patient that type 2 diabetes differs from type 1 diabetes primarily in that with type 2 diabetes

Which of the following is a characteristic of the animals in the phylum Chordata?

Which of the following is a characteristic of whales that makes them more efficient at swimming?

Whales use low frequency sound waves during echolocation for

Hagfishes are mostly scavengers that feed on dead or dying animals.  They produce a chemical compound that can turn seawater into a thick slime.  This slime is used as a defense mechanism against predators.

The Steller’s Sea Cow is a sirenian that lives in the North Pacific.  The populations of this large marine mammal (some reach 30 feet and 8,000 pounds) are currently low and are considered endangered.