Tag: zoology

Fishes are ectothermic, commonly referred to as cold-blooded animals, meaning their internal body temperature varies with the ambient environment. They cannot regulate their body temperature internally like birds and mammals.

The axis vertebra, which is the second cervical vertebra, is uniquely identified by the presence of the odontoid process, also known as the dens. This bony projection acts as a pivot around which the atlas vertebra and skull rotate.

Arctic terns, salmon, and Siberian cranes are well-known for their long-distance annual migrations. Salamanders generally do not perform long-distance annual migrations.

In anurans (frogs and toads), the caudal vertebrae are fused into a single rod-like bone called the urostyle.

Because they are supposed to be associated with the function of excretion just like liver.

The axis vertebra is characterized by the odontoid process, which allows for the rotation of the head.

Interstitial fluid is often described as resembling sea water in its ionic composition, reflecting the evolutionary history of life originating in a marine environment.

Echinodermata and all chordates are deuterostome and enterocoelous.

(A) Cyclostomes - Agnatha

Taxonomy (taxis-arrangement, nomos-law) is defined as the science dealing with identification, nomenclature and classification of organisms. The term taxonomy was given by de Candolle $(1813)$.