Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Evolution of Metazoa
The sponges, coming under phylum Porifera are the closest to Protista, and can perhaps be regarded even as a colony of protists rather than being multicellular. No other group has evolved from them. The coelenterates consisting of the Cnidaria and the Ctenophora, which are both diploblastic and primarily radially symmetrical, can be regarded as truly the most primitive of the Metazoa. They have evolved from the ancestral planuloid metazoans as an offshoot:
Figure: Phylogeny of the animal kingdom
The Platyhelminthes (flatworms) have also evolved from planuloid ancestor. They do not have a coelomic cavity (acoelomates) but the mesoderm is cellular, they are triploblastic and are bilaterally symmetrical. This group and all higher Metazoa can be grouped as Grade Bilateria.
The pseudocoelomates phyla which include the nematodes and the rotifers are supposed to have evolved as an offshoot from the flatworms.
The Eucoelomata constitute the remainder of the Metazoa. The acoeloid flatworm like ancestors have given rise to two main stocks:
Species Diversity - Synthetic Characters It is one of the most important and basic characteristics of a community. There are various ways of measuring species diversity the si
What is Class Reptilia ? Class Reptilia include the vertebrates that have successfully transitioned to a terrestrial lifestyle by evolving protective scales and a "land egg."
Enumerate the different means of evaluating the implant prior to stage 2 surgery. The Different means for evaluating the implant prior to stage 2; i) Radiographic evaluation
SMAC K - It is a crud by product of heroin synthesis, commonly called brown sugar (Poor man's heroin). The addicts heat the smack powder & inhale its vapour. It is
Respiratory Care on Admission (First two hours) Patient is incubated and ventilator-dependent. Monitor blood gases hourly and take corrective action immediately.
Determine the function of human body system Human body has different systems to perform different functions. A system consists of organs to perform a particular set of function
Q. What are the four groups of protozoans? The four main groups of protozoans are the mastigophores flagellated, like the trypanosome that causes Chagas' disease, the sarcodine
Tina administered 1 liter of sterile distilled water IV to a patient. Predict the direction (increase, decrease, no change) you would expect Tina's infusion to have produced in the
C omp uted tomography: Computed tomography (CT imaging) is also known as CAT (computed axial tomography) scanning and it is based on the X-ray principle. The CAT sc
Cidofovir (Vistide) IV cidofovir given once weekly for 2 weeks and then once every 2 weeks for maintenance therapy can delay progression of CMV retinitis in patients with AIDS
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd