Birds have undergone many structural adaptations or modifications to suit their aerial life. Some of these adaptations are as follows:
1.They have a Streamlined body for rapid and smooth movement.
2.Covering of body with feathers for insulation.
3.Their forelimbs are modified into wings and their hind limbs are used for walking, perching, and swimming.
4.The presence of pneumatic bones to reduce weight.
5.Presence of additional air sacs to supplement respiration
Match the following:
|Column I||Column II|
|(a) Operculum||(i) Ctenophora|
|(b) Parapodia||(ii) Mollusca|
|(c) Scales||(iii) Porifera|
|(d) Comb plates||(iv) Reptilia|
|(e) Radula||(v) Annelida|
|(f) Hairs||(vi) Cyclostomata and Chondrichthyes|
|(g) Choanocytes||(vii) Mammalia|
|(h) Gill slits||(viii) Osteichthyes|