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.
DRU G NOMENCLATURE - Generally drug has three types of names - Chemical, Proprietary & Non-proprietary. Chemical Name - Indicates chemical nature. Proprietary Name -
Illustrate the thin and think filaments in the muscle fiber A healthy skeletal muscle fiber is isolated and has no external forces on it. It has normal intracellular levels of
History of Ecology The roots of ecology lie in Natural History, which is as old as human civilisation itself. As a matter of fact man indulged in ecology in a practical sort of
What evidence did Charles Elton collect that suggested that fluctuations in hare and lynx populations were related? What other evidence shows that these fluctuations ma
Effect of pH or Nutrient Availability One of the greatest influence of pH on plant growth is through its effect on the nutrient availability. When base saturation is less than
What are the Disadvantages of mucoperiosteal flap More traumatic - flap is raised Sutures are required and the next procedure of impression is delayed till afterthe suture
Define Fraction in which Calcium in plasma is Present? Calcium in plasma is present in three major fractions: Ionized calcium Protein bound calcium Complexed c
Determine the use of OPG An OPG is used to see the possibility for an anterior loop which is found to extend about 1-3 mm anterior to the mental foramen in about 12 per cent
define alimentary canal
Emerging and New Generation By-Products Oil palm by-products are good examples of NCFR which are becoming increasingly important new feeds. This is associated with the rapidly
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