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

Breast cancer, Breast Cancer Normal 0 false false ...

Breast Cancer Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4

Does the molecule will remain unchanged, A double-stranded piece of DNA, 10...

A double-stranded piece of DNA, 100 base pairs in size, is exposed to a high pH environment. This causes all non-valent interactions to be disrupted. What will result from this tre

How to lower the risk of drug-nutrient interactions, How to Lower the Risk ...

How to Lower the Risk of Drug-Nutrient Interactions? Eat a healthy diet using the food guide pyramid. Follow directions on how to take medication (prescription and ove

Explain adverse effects of stavudine, Explain Adverse effects of Stavudine ...

Explain Adverse effects of Stavudine Fatal lactic acidosis may happen more frequently with stavudine than with other NRTIs. Serum aminotransferase activity may enhance with sta

Pulmonary artery vary from pulmonary vein, In what two ways will the compos...

In what two ways will the composition of blood coming from the pulmonary artery vary from that going to the pulmonary vein? Blood in the pulmonary artery will have less oxygen

Explain procedure for analysis of air of processing facility, Explain Proce...

Explain Procedure for Analysis of Air of Processing Facility? Now conduct the experiment following the steps enumerated herewith: 1. Label the Petri plates with nutrient aga

Explain about the shade drying, Explain about the Shade Drying? Shade d...

Explain about the Shade Drying? Shade drying is carried out for products which can lose their colour and/or turn brown if put in direct sunlight. Products that have naturally v

What process occurred during the formation of the platelet, Removal of a pa...

Removal of a patient's peripheral intravenous catheter resulted in brief bleeding and the loss of a small amount of blood. Which of the following processes occurred during the form

How can triglycerides be decreased, Q. How can triglycerides be decreased? ...

Q. How can triglycerides be decreased? Triglycerides could be decreased by: - limiting foods high in fats - decreasing sugar and sugar containing foods (carbonated bevera

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