The Origin of Whales

Origin of Whales
What is the primary evidence that suggests whales evolved from land-dwelling ancestors?

• Their ability to hold their breath underwater

• The presence of vestigial leg bones in whale skeletons

• Their large size compared to land animals

• Their diet, which includes both fish and plankton

Origin of Whales

What is Pakicetus?

• A type of modern whale

• A species of shark

• An extinct land animal with connections to whales

• A deep-sea fish

Origin of Whales

What unique skeletal feature links Pakicetus to modern whales?

• Large fins

• Special bones around the ear

• A blowhole on the top of the skull

• A long, flexible spine

Origin of Whales

Why do scientists believe whales are more closely related to camels than to sharks?

• Whales have sharp teeth like camels

• Whales and camels share similar respiratory systems

• Both have a unique ankle-bone structure called a double-pulley astragalus

• Whales and camels are both herbivores

Origin of Whales

What happens if a modern whale gets stranded on a beach?

• It can survive indefinitely

• It will die if it cannot return to the water

• It will begin to grow legs

• It will adapt by breathing through its skin

Origin of Whales

What is the function of a whale’s blubber?

• It helps them move faster in water

• It protects them from predators

• It helps insulate them in cold ocean waters

• It provides oxygen storage for deep dives

Origin of Whales

How do scientists study the evolutionary history of whales?

• By observing their swimming patterns

• By examining their skeletal structures and fossil records

• By comparing their diets to land animals

• By analyzing their sleeping habits

Origin of Whales

What is the main purpose of a blowhole in whales?

• To help them balance while swimming

• To regulate body temperature

• To assist in deep diving

• To allow them to breathe while at the surface

Origin of Whales

Whales are more closely related to sharks than to land mammals.

• True

• False

Origin of Whales

Pakicetus looked very similar to modern whales.

• True

• False