Reinstalling Windows clears your data This is a big mistake when it comes to problems with your laptop, and if the fix fails without installing Windows, this trick is going to come in handy. However, it is possible to rearrange the computer. It is inevitable that if your computer slows down at any time, then you have to adopt a stra…

T o Download Lecture in pdf form go to end of the page Vertebrates (Fishes) Phylogenetic Relationships: Fishes: Sub-Phylum Craniates. Skull Surrounded the brain Having sense organs such as OLPHACTORY ORGANS Eyes Inner ears Classification of Fishes      Fishes are divided into 2 infra phylums (1)      Infra phylum h…

Urochordates: They are marines known as sea squirts They are solitary or colonial Fixed or free-swimming Numerous gill slits are present The body is covered by a cuticle called a tunic. only in Larval Stages notochord is present. Dorsal tubular nerve cords are present in the larval form while degenerate in the form of the small …

go to the end of this page to dowload pdf Classification of chordates: They have 45,000 species      Generally, classified into 3 Sub-Phylums. (1) Sub-Phylum Urochordates (2) Sub-Phylum Cephalochordates (3) Sub-Phylum Craniata 1. Sub-Phylum Urochordates: Their notochord, nerve cord, and post-anal tail are present only in free-sw…