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.
Why is the number of bonds important in nucleic acids
Q. Explain Atrial Pressure? The RA pressure wave form has three positive deflections - "a", "c", and "v" waves. The "a" wave is due to atrial systole and follows the P-wave on
What is Colloids and Suspensions ? Colloids and Suspensions : Colloids and suspensions are mixtures in which larger particles replace solutes. Colloids, or colloidal suspe
Q. What is the cyclosporin? How are fungi related to this substance? Cyclosporin is a drug discovered in the 1970's that revolutionized organ transplantation in Medicine, It is
How much salt is in the human body? 50 Kilo human has about 7 tablespoons of salt inside there body.
State the term - Viral Infections A virus is an encapsulated aggregate of nucleic acid that may be made of either DNA or RNA. Some viruses, such as those causing poliomyelitis
In what ways has biotechnology changed agriculture in the United States? Select all that apply. the development of herbicide-resistant crops the disappearance of wild plant populat
Social Determinants of Health - Transport Rising worldwide incomes have led to a massive use of automobiles and in particular cars. Cars are seen as a threat to health because
Environment All organisms are intimately dependent on the environment from which they derive their sustenance. Organisms from virus to man are obligatorily dependent on the envi
Q. Limitations in the Diagnostic use of Stress Echocardiography? Although the presence of coronary artery disease is readily recognised in the setting of multivessel disease, a
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