In some land invertebrates and some aquatic invertebrates and vertebrates, respiratory structures to use atmospheric oxygen developed. These are tracheae, book-lung in arthropods, pulmonary sac in prosobranch and lung in pulmonate molluscs and accessory respiratory organs in fishes. 1. Tracheae and Book-Lungs: Unlike other terrestrial animals, the cells of insects obtain their oxygen supply directly from the air through a [...]
The upcoming discussion will update you about the difference between reptiles and birds. Difference # Reptiles: 1. The exoskeleton consists of horny epidermal scales, sometimes provided with bony dermal plates. 2. The central of the vertebrae are usually procoelous. 3. Sacrum when present, its vertebrae (usually two in number) bear large expanded ribs, with the ends of which the ilia [...]
In this article we will discuss about the classification of class aves. 1. Body has three distinct divisions with a flexible neck and covered with feathers of different kinds for the most part. 2. Limbs two pairs, the anterior pair modified as wings for flight, and the posterior pair adapted for perching, walking or swimming. 3. Each foot is usually [...]