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!
Origin and Evolution of Metazoa
Most of the early metazoans were soft bodied and so their fossils are rare. The extremely fragmented fossil record does not shed any specific light on their origin. Therefore, 'most of the explanations on their origin are based on their embryology and -comparative morphology. A series of theories have been put forward to explain the origin of multicellular metazoans from unicellular organisms. Of these, three principal theories could be considered.
1) Syncytial Theory: That the ancestral metazoans have arisen from a multinucleate. ciliate by compartmentalization or cellularization.
2) Colonial Theory: That the ancestral metazoans have arisen from colonial flagellates by cellular specialisation and interdependency.
3) Polyphyletic Theory: That the metazoans have arisen from more than one group of organisms.
Q. Do all molecules of DNA have the same amounts of nitrogenous bases? Number and sequence of nitrogenous bases in DNA molecule are key elements in variations which are found i
Types of Neural networks Neural networks can be grouped into: Sensory filter networks that are organised so as to pass on only certain features of a complex senso
Viscosity The viscosity at temperatures above its gelation point is relatively constant at pH values of 4.5 to 9.0 and is not greatly affected by age or ionic strength within
Q. What is Acetobacter? These bacteria, also known as "vinegar bacteria", cause significant spoilage in the wine industry but are necessary for vinegar production. The importan
Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4
biting mechanism in snakes?
You are working at a large, well funded research institute with the latest biochemical techniques available. The focus of your research is to find a specific mutation, or set of mu
Health Impacts of Water Pollution It is well known that clean water is absolutely essential for healthy living. Although adequate supply of fresh and clean drinking water is a
Sulphur Sulphur is a component of the animo acids methionine, cysteine and cystine; the B-vitamins, thiamin and biotin; as well as a number of the organic compounds. Sulphate,
Explain about the Commercial Sterility? It is important to remember that bacterial destruction is a logarithmic function, complete destruction not probable to make food commerc
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