Question

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What are the four general phases through which scientists believe whales evolved?

Answer 1

Unlike the hippo's ancestor, whale ancestors moved to the sea and evolved into swimming creatures over a period of about 8 million years. Fossils of gigantic ancient whales called Basilosaurus were first mistaken for dinasaur fossils but were later recognised as mammals.

Answer 2

Answer:

Charles Darwin proposed that all species were descended from other species and eventually had one common ancestor. With whales being mammals, and mammalian ancestors being land animals, whale ancestors must have lived on land too.

They breathe air and nurse their young with their own milk, they also have paddle-shaped flippers which encase hand bones with five 'fingers'. As embryos, whales have tiny back limbs which disappear before birth.

(90% sure)