With the help of the given information write your comments on evidences of evolution. Mammals have fore limbs as do birds, reptiles and amphibians. The basic structure of the limbs is similar, though it has been modified to perform different functions.
Answers
1. The given information that "Mammals, birds, reptiles and amphibians all these have fore limbs which have similar basic structure" gives the evidences of evolution.
2. They are modified to perform different functions.
3. These organs are called homologous organs.
4. It indicates that all the vertebral have evolved from a common ancestor.
5. This type of evolution is called divergent evolution.
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Answer :
i. The organs which have the same basic structure but different functions are called homologous organs.
ii. The homologous organs of different animals provide evidence for evolution. The that internal structure of forelimb of a whale (swimmer), a wing of a bird (flyer) the leg leopard (runner), the claw of mole (digger) and hand of a man (grasping) has the same origin.
iii. If we carefully observe the anatomy of all these animals have a common pattern in the arrangement of bones even through their external from and functions are different.
iv. This indicates that all the vertebrates have evolved from a common ancestor and these organs are called homologous organs and this type of evolution is known as divergent evolution.