OBJECTIVE LIFE SCIENCE
EVOLUTION
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
The ancestors of whales may have been land mammals
|
|
|
Whales could walk if they wanted to
|
|
|
Whales are preparing to evolve into land animals
|
|
|
Someday whales will be able to walk and will have legs
|
Detailed explanation-1: -Looking at a whale’s body and biology, there are plenty of clues that their ancestors lived on land. 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.
Detailed explanation-2: -A whale’s pelvic bones, which were once attached to legs, are also vestigial structures. Whales are descended from land-dwelling ancestors that had legs. Homologous structures are structures that have a common function and suggest common ancestry.
Detailed explanation-3: -Though they were now gone from the Earth’s seas, the basilosaurids left their legacy behind. Modern research strongly suggests that all modern whales are descended through the basilosaurids.