Polyphyletic theory - metazoa, Biology

Assignment Help:

Polyphyletic Theory - Metazoa

This theory was suggested by Greenheig (1959) and some other workers. According to this theory, sponges, coelenterates, ctenophores and flatworms have each evolved independently from protozoans. Sponges and coelenterates have probably arisen through colonial flagellates, while ctenophores and flatworms through ciliates or even mesozoans.

It is apparent that this theory is a compromise between the Syncytial and colonial theory.


Related Discussions:- Polyphyletic theory - metazoa

What are the factors to an actual shift in the demand curve, What are the f...

What are the factors to an actual shift in the demand curve? Factors that cause an actual shift within the demand curve are as follows: When prices rise or fall that would c

Explain the root-end preparation - endodontic surgery, Explain the Root-End...

Explain the Root-End Preparation - endodontic surgery a. Class I type preparation, 3mm depth. b. Tips are designed in a length of 3 mm to prevent procedural errors. c. Ul

Coronary prevention, a) The West of Scotland Coronary Prevention Study (WOS...

a) The West of Scotland Coronary Prevention Study (WOSCOPS): The study randomized healthy men between the ages of 45 and 64 years with TC levels higher that 252 mg/dL and LDL chole

What is choanoflagellate. explain in brief., What is Choanoflagellate? Expl...

What is Choanoflagellate? Explain in brief. The protozoans which resemble the choanocyte cells found in sponges. They have a collar of microvilli which surround a central flage

Legal level -pollution control, Legal level -Pollution control Polluti...

Legal level -Pollution control Pollution must be controlled by effective legislation also. Like USA, Japan, Germany and many other countries a comprehensive legislation for pr

Differences between genomes in prokaryotes and eukaryotes, What are the dif...

What are the differences between genomes in prokaryotes vs. eukaryotes?

Express the monomer unit of a protein, Describe the monomer unit of a prote...

Describe the monomer unit of a protein and how monomer units are assembled into peptides.

Hypothermia, Hypothermia As the blood passes through the oxygenato...

Hypothermia As the blood passes through the oxygenator, hypothermia machine allows the blood to cool to the required temperature. Generally, the temperature is brought dow

Define the use of computers in numerical taxonomy, Define the Use of Comput...

Define the Use of Computers in Numerical Taxonomy The use of computers in numerical taxonomy has made it possible to compare a large number of characters from many organisms wi

Why is the uricotelic excretion essential for reptile, Q. Why is the uricot...

Q. Why is the uricotelic excretion essential for reptile and avian embryos? In birds and reptiles the excretory system is uricotelic since uric acid is less toxic, insoluble an

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

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!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd