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:
distinguish between striated and cardic muscles
What is a phyletic lineage?
Explain the Urinary System in human body? The urinary system removes the waste materials produced as a result of all the metabolic process required to sustain life. The process
Can enhancers work in trans? That is, can an enhancer on one piece of DNA activate a promoter on another piece of DNA. Propose an experiment to test this. Be sure to discuss any ap
Explain the Ecological Approach in Taxonomy You already known that the use of ecological data in classification has been used since the time of Plato who considered aquatic, te
Q. Use of Examination Gloves? Examination Gloves - latex, vinyl, nitrile, neoprene Gloves are worn whenever contact with blood, saliva, mucous membranes or blood/saliva-cont
Q. What is the contraceptive mechanism of the IUD? The IUD (intrauterine device) is a piece of plastic coated with copper that is put-in within the uterus by a doctor. Coppe
Give ditail account on regernation in invertebrates and vertabrites
In the human body, the potassium ion can pass easily through cell membranes, yet the potassium ion concentration is higher inside many cells than it is outside these cells. Could t
Uncompetitive inhibition In this type of inhibition, the inhibitor only binds with the enzyme-substrate complex making it inactive. As a result, the product formation
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