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.
Discuss the similarities and differences of transposable elements in E. coli, yeast, plants, and Drosophila.
What is inheritence and what is the relation between mendel and darwin?
Forebrain 1 . OLFACTORY LOBES - 1 pair, very small, solid, club shaped, separated from each other. Fully covered by cerebral hemispheres on dorsal side, clear on
Q. Show the Symptoms of salmonellosis? Symptoms: The susceptibility of humans varies with the species and strains of the organism and the total number of bacteria ingested. A
Explain the Objectives of nutritional care? - To minimize the development of nutrient imbalance. - To maintain fluid and electrolyte homeostasis - To promote energy equil
Uses of Hydrocolloidsfor health Hydrocolloids, together with other dietary fibres are increasingly being seen as contributing to a number of health effects. Some of the hydroco
Q. How is the light from the sun transformed into chemical energy to be used by the living beings on earth? Light from the sun is converting into chemical energy contained in o
Peculiarities of Mitosis - Cleavage From the following you will learn that the mitosis in the phase of cleavage has some striking peculiarities: a) Synchronization of cell
Effect of processing on mineral content of foods Minerals are comparatively stable under processing conditions such as heat, light, use of oxidizing agents and extremes in pH.
Which one of the following kinds of animals are triploblastic? 1. Flat worms 2. Sponges 3. Ctenophores 4. Corals Flat worms
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