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Overview of Human Evolution

In marine-mam...

Question

In marine-mammals like whales and dolphins, the limbs are modified into __which are used as oars to swim in water.

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Solution

A flipper is a typically flat forelimb evolved for movement in water. Various creatures have evolved flippers, for example, in penguins they are called wings and in dolphins and whales they are usually known as fins.

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Name two marine mammals with limbs modified into flippers for swimming in water.

Q. Which option best summarizes the following lines from the passage:
This divergence in response to evolution is commonly expressed by altering the form and function of some part(s) of the organism, the original identification of which is clearly discernible. For example, the creeping foot of the snail is seen in related marine pteropods to be modified into a flapping organ useful for swimming and is changed into prehensile arms that bear suctorial disks in squids and other cephalopods. The limbs of various mammals are modified according to several different modes of life -for swift running (cursorial) as in the horse and antelope, for swinging in trees (arboreal) as in the monkeys, for digging (fossorial) as in the moles and gophers, for flying (volant) as in the bats, for swimming (aquatic) as in the seals, whales and dolphins, and for other adaptations.

Sea mammals like dolphins and whales are forms of fishes.

dolphins and whales are mammals or not

Q. If a crocodile has a four chambered heart, this is it not considered a mammal similar to dolphins and whales or platypuses and echidna? Is it because they don't have mammary glands ? Do whales and dolphins have mammary glands if no why are they mammals?

PS- sorry for grouped questions but these are very closely related...

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