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Are the extraembryonic membranes the same in all vertebrates?
The presence of each extraembryonic membrane varies according to the vertebrate class.
In fishes and amphibians only the yolk sac is present. In reptiles and birds besides the yolk sac there are also the amnion, the chorion and the allantois. In placental mammals besides all these membranes the placenta is present too.
Q. What is biological control? The Biological control is a natural method to control the size of microorganism, animal or plant populations. The Biological control is based on
The various organs involved in the digestion process are: Alimentary tract which includes mouth, pharynx, esophagus stomach, small intestine, large intestine, appendix, rec
Q. Pathophysiology of mitral stenosis? Normally there is no pressure gradient between left atrium and the left ventricle during diastole. However, as the valve orifice size dec
Solid waste management, Other Management The solid wastes from a summer camp with 100 children and a staff of 25 are to be collected once per week. If bottles and cans (representi
Define Historical example for scaling from individual to ecosystems? Biological oceanographers have long utilized physiologically based models like the Droop model, which reduc
phylogenetic consideration
Impulses reaching the AV node from the atria are delayed a little as they pass through the trunk and crura. The impulses first reach the papillary muscles and their contraction clo
Reaction specificity Some enzymes catalyze only one reaction acting on a specific substrate. Example: urease and catalase acts only on urea and hydrogen peroxide,
Metamerism oe Segmentation In the early coelomates the coelom was not divided into segments, the whole body cavity was a single space. Hence body movements were not precise.
Q. Describe Sampling of grains? The quality of the food grains is assessed starting with the process called sampling. A sample of the product to be evaluated is taken and the
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