A) Large fishes
B) Seaweeds and other marine autotrophs
C) Polyps of live coral
D) Worms and other small,bottom invertebrates
E) Small fishes
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A) A small amount of air is kept in the lungs before diving
B) A large amount of air is kept in the mouth before diving
C) Normal breathing is maintained before diving
D) Several deep breaths are taken before exhaling and diving
E) No actual breathing takes place before diving
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A) Live on polar regions of the Northern and Southern hemispheres
B) Can be found as far north as the Equator
C) Are ectotherms
D) Time their reproduction so that eggs hatch during the winter
E) Are able to fly when disturbed
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A) Sperm oil
B) Baleen
C) Skin
D) Melon
E) Undigested food
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A) Jumping above the surface
B) Getting stranded on shore
C) Singing
D) Emitting sound for navigation
E) Diving deep to feed
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A) Bottlenose dolphin
B) Sperm whale
C) Blue whale
D) Gray whale
E) Humpback whale
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A) Small plankton
B) Small fishes
C) Squid
D) Largest plankton
E) Bottom crustaceans
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A) Flukes
B) Teeth
C) Dorsal fin
D) A blowhole
E) Ear opening
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A) sea turtles
B) dolphins
C) sea lions
D) sea otter
E) penguins
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A) Sperm whale
B) Narwhal
C) Beluga whale
D) Bowhead whale
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A) Killer whale
B) Seals
C) Sea otter
D) Sea lions
E) Manatee (sea cow)
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A) Oviparous
B) Leave the water to reproduce
C) Have a shell that is free from the backbone
D) Are tetrapods
E) Are "cold-blooded"
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A) Small
B) Located just before the tail
C) Located just before the head
D) Internal until just before copulation
E) Absent
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A) Rigid and have small hairs on one side only
B) Soft and have hairs all around their surface
C) Rigid and have hairs all around their surface
D) Rigid without any hairs
E) Soft without any hairs
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A) Pairs mate for life
B) The females lay a single egg during winter
C) They live in the Arctic
D) The male tends egg during development
E) Their eggs develop in about 64 days
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A) Having more red blood cells to store more oxygen
B) Having more hemoglobin to store more oxygen
C) Slowing down of heart rate
D) Lower tolerance to lactic acid
E) Having a lot of myoglobin in muscles to store more oxygen
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A) Do not exist at all
B) Are gill-breathers
C) Are fish-like
D) Include only tropical species
E) Are oviparous
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A) Born tail first
B) Establishes a long and strong bond with its mother
C) Feeds on very rich milk that is squirted directly into its mouth
D) Is born with developed blubber
E) Must swim to the surface immediately after birth
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