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. What are the major cellular features of fungi? There are pluricellular and unicellular fungi. All fungi are heterotrophs and eukaryotes. Fungi have cells with cell wall m
What is the difference between ulcerative colitis and Crohn's disease? The differences between the two include: I) Anatomic distribution of the inflammatory process: Crohn'
What is osseointegration The smaller the devital zone that forms around the implant subsequent to the surgical trauma, the more likely rigid fixation will occur. The aim is to
Explain the steps of converting food into energy. There are four steps to convert food into energy: a) Ingestion, mastication and swallowing : Ingestion or taking in of food
Mitral Valve replacement with Allograft (Mitral homograft) : C. Acar and colleagues used mitral allograft for mitral valvc replacement using a new technique of fixation of p
Mineral availability of organic mineral complexes A number of mineral chelates and complexes are available from a variety of manufacturers. A chelate is described as a metal c
What were coopers views on nature (particularly in regard to human progress and resource use)? And Is there any thought about rights of nature or conservation of resources in her w
MEDICA L SCIENCE IN ANCIENT INDIA Dhanvantri -"God of Medicine". Ashvini Kumar - Famous medical man of vedic times. Susruta - First Indian to study human anatomy;
Chemical disasters arise from harmful and potentially hazardous chemicals, which if released of misused can pose a threat to the environmental. Its range depends upon military and
Explain Endoskeleton in detail. Supporting structures of the skeleton surrounded by the body tissues. As a consequence, there is living tissue on all sides of endoskeletal stru
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