Exam 13: The Nekton: Swimmers of the Sea

Sea snakes are found in the Atlantic, Pacific, and Indian Oceans.

Baleen whales lack ________.

In what year was the Marine Mammal Protection Act established?

Which of the following increased humans' abilities to harvest the great whales?

The smallest marine mammal is a ________.

Walrus feed on ________.

Marine mammals are able to maintain their own body temperature internally.

Which of the following reptile groups is not represented in the ocean?

Sea otters depend on a thick layer of fat (blubber) to stay warm.

The most numerous organisms in the sea are fish.

Dolphins and porpoises are small-toothed whales.

Sea snakes spend less than half their time in the marine environment.

All toothed whales use echolocation except baleen whales.

The very large eyes of the giant and colossal squid are adapted to ________.

Marine mammals use echolocation to detect objects. For echolocation to work, marine mammals must be able to ________.

The large tusks of the male walrus are used exclusively for fighting off other males during the mating season.

There are no endothermic marine organisms.

Whales and seals increase their floatation by ________.

Each year, the bowhead and beluga whales migrate from Antarctica to southern California.

One particular feature found in bony fishes but is absent in cartilaginous fishes is ________.