(i) A. Organs or features can be adopted to new functions during evolution Example-Feathers were developed from providing insulation in cold Weather(in Dinosaurs) but in birds they were adopted for flight.

B. “Older body design are not efficient”. Example-simplest form like Bacteria, which inhibits most inhospitable habitat like, hot springs, deep sea, thermal vents and ice in antarctica.

(ii) The study of classification of various organisms gives us an idea about the evolutionary history of the organisms, Which have certain similar characteristics are placed in one group. It can be thus concluded that the organisms placed in one group may have evolved from common ancestors and may have a common evolutionary history.