Statement (S). Arthropoda are the most successful of all known animal groups
Reason (R). Arthropoda exhibits the greatest adaptive radiations and have adapted to diverse habitats.

Arthropoda are regarded by most biologists as the most Successful of all animal groups. What do you suppose the reasons ?

In the following questions , a statement of assertion (A) is followed by a statement of reason (R). A: Arthropods are the most successful of all animal groups. R: Evolution of jointed appendages and chitinous exoskeleton allowed arthropods to successfully invade every habitat on earth.

In the following questions , a statement of assertion (A) is followed by a statement of reason (R). A: Arthropods are the most successful of all animal groups. R: Evolution of jointed appendages and chitinous exoskeleton allowed arthropods to successfully invade every habitat on earth.

Statement (S ) : The concept of survival of the fittest is central to natural selection. Reason (R ) : Individuals who posses advantageous characters to adapt to the environment have better potential for survival.

....... P ......... represent one of the best examples of Adaptive radiation . Another example is ....... Q........A number of .....Q..... , each different from the other evolved from an ancestral stock , but all within the Australian island continent . When more then one adaptive radiation appeared to have occurred in an isolated geographical area ( representing different habitats ) , one can call this ..... R.........

....... P ......... represent one of the best examples of Adaptive radiation . Another example is ....... Q........A number of .....Q..... , each different from the other evolved from an ancestral stock , but all within the Australian island continent . When more then one adaptive radiation appeared to have occurred in an isolated geographical area ( representing different habitats ) , one can call this ..... R.........

Assertion :-Tasmanian wolf and Placental wolf are the good example of convergent evolution. Reason :- More than one adaptive radiation appeared to have occured in an isolated geographical area, (representing different habitats) one can call this convergent evolution.