Q. In birds, the vertebrae are
Solution:
Solution:
Some of the general characteristics of class Aves:- They are genuinely flying vertebrate having feathered bipeds; wings are modified forelimbs; have a streamlined body and possesses a beak; modified hindlimbs are present which generally have scales; the respiration is through spongy and inelastic lungs; to supplement respiration air sacs are connected to lungs; they not have a urinary bladder; they have pneumatic (hollow) bones; in female birds single ovary is present; they are uricotelic; minute, oval and nucleated erythrocytes are present; they are warm-blooded (homeothermic), and the heart is completely having four-chambered; they have heterocoelous vertebra; separate sexes are present, and fertilization is internal with direct development; they are oviparous.