Marine tetrapod vertebrates do not have
Sea turtles must leave the oceans to lay eggs.
Sea turtles swim by means of
|A)||A large tail.|
Besides humans, sea turtles are eaten by
|B)||Great white sharks.|
|C)||Land crabs and birds.|
Green sea turtles, when ready to lay eggs, migrate to the nearest isolated sandy beach that they happen to encounter.
All 7 species of sea turtles are threatened, whereas 4 species are endangered.
Marine iguanas can feed in cold ocean water because they warm up by basking in the sun on rocks.
The most dangerous marine reptile is the
Most seabirds breed in large colonies on land, and form life-long pair bonding.
Emperor penguins keep their eggs warm by which means?
|A)||Retaining them in a brood pouch|
|B)||Building a large protected nest|
|C)||Placing them between their feet and lower body|
|D)||Lining the nest with down|
Penguins are found mostly in the Antarctic and Arctic regions.
A penguin's wings are used for
A tubenose bird can be told from a gull by its
Seabird guano can be useful for human purposes.
Some seabirds migrate as much as 16,000 km from one polar region to the other, and may never experience a polar winter.
Mammals constitute the largest group of vertebrates in terms of number of species.
Seals retain body heat by means of
Unlike a true seal, a sea lion has
|D)||A pair of tusks.|
Fossils of the earliest whales do not have blowholes.
The skeleton of a modern whale has
|A)||No rear limb bones.|
|B)||Very small rear limb bones.|
|C)||Small front flippers.|
Among the great whales, the one that eats squid is the
Baleen whales have very long, hard teeth for straining small animals from the ocean.
The pleated throat of many baleen whales is used like an expanding accordion to draw in large amounts of water and food.
Dolphins are not able to
|A)||Learn from observation.|
|C)||Form complex societies.|
|D)||Filter food through bristles in the mouth.|
Cetaceans move their tails up and down while fishes move theirs side to side.
Adaptations for deep diving in marine mammals do not include which of these?
|B)||Oxygen storage in muscles|
|D)||Efficient air exchange at the surface|
The bends condition is caused by carbon dioxide bubbles forming in the blood due to pressure changes in diving.
Marine mammals avoid the bends by returning to the surface very slowly after a deep dive.
Echolocation is used not only by most toothed whales, but also by some pinnipeds and probably some baleen whales.
It is thought that cetaceans produce a mental "picture" of objects using echolocation sounds, since they can recognize objects by sight previously only sensed by sound.
Most cetacean calves are born head-first in order for the newborn to quickly gulp in air at the surface.
Pinnipeds often exhibit harem breeding with a dominant male mating with many females and fighting off other males.
Generally, pinnipeds breed
|A)||In the water.|
|B)||In family groups at sea.|
|D)||Only at night.|
Which of these countries still hunts minke whales?
If a can of tuna bears a "dolphin-safe" label, it means that
|A)||The country of origin does not use drift nets.|
|B)||The quota of dolphins killed while fishing is regulated by the IWC.|
|C)||Fishing was conducted using special purse seine nets.|
|D)||The tuna were taken by American fishermen.|