question_answer

Both plants and animals of many sorts show remarkable changes in form, structure, growth habits and even mode of reproduction in becoming adapted to different climatic environment, types of food supply or mode of living. This divergence in response to evolution is commonly expressed by altering the form and function of some part or parts of the organism, the original identity of which is clearly visible. For example, in marine pteropods the creeping foot of the snail is modified into flapping organs useful for swimming. It is changed into prehensile arms that bear suctorial disks. The limbs have been modified into different organs in different animals. For cursorial animals like horse and antelope it has been adopted as a limb and helps the animals in running. For arboreal animals like monkeys it helps in swinging in trees. For fossorial animals like moles and gophers they help for digging. For volants like bats they help in flying. For aquatic animals as in the seals and whales they help in swimming. Thus, the fingers and wristbones of a bat and whale, for instance, have virtually nothing in common except that they are definitely equivalent elements of the mammalian limb.

The author provides information that would answer which of the following questions:

I.  What factors cause change in organism?

II. What is the theory of evolution?

 

A) I only                          

B) II only

C) I and II      

D) Either I or II

E) None of these