Evidence for Evolution: A Deep Dive into Cetaceans

What does the theory of biological evolution claim about the relationship between living things?

• Only similar species are related.

• Only animals are related.

• All living things are unrelated.

• All living things on Earth are related.

From which ancient creatures are cetaceans believed to have evolved?

• Four-legged land mammals

• Aquatic invertebrates

• Ancient birds

• Large reptiles

Which feature do whales share with land mammals?

• Gills for breathing

• Cold-blooded nature

• Scales covering the body

• Live birth and milk feeding

What does the presence of hair on whales indicate?

• Adaptation to cold water

• A unique evolutionary trait

• Relation to land mammals

• Relation to birds

What do the vestigial leg bones in whales suggest?

• They are remnants from their land-dwelling ancestors.

• They are used for catching prey.

• They are used for swimming.

• They are a new evolutionary feature.

What evolutionary evidence is provided by the anatomy of whale flippers?

• Absence of any bones

• Presence of fin-like structures

• Similar bone structure to human hands

• Development of gills

What similarity is observed between dolphin and human embryos?

• Both embryos are aquatic.

• Both develop wings.

• Both show development of leg buds.

• Both develop gills.

How do whale embryos provide evidence for evolution?

• They develop scales like fish.

• They show temporary leg buds.

• They develop feathers.

• They remain unchanged throughout development.

What feature of basilosaurid whales indicates a transitional form?

• Fully developed wings

• Nostrils positioned midway on the skull

• Nostrils at the end of the snout

• Fully aquatic adaptations

Why are Maiacetus considered whales despite having features of land mammals?

• They lived entirely on land.

• They had fully developed legs for walking.

• They were found among sea-creature fossils.

• They had feathers like birds.