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Q. What is signifying when it is said that beings of the phylum Annelida are vascular beings? From which other phyla of the animal kingdom does this feature differentiate them?
The classification of these beings as vascular beings means that they have a circulatory system, with vessels that distribute substances all through the body.
Poriferans, cnidarians and flatworms do not have a circulatory system. In nematodes there is circulation of nutrients and gases through the pseudocoelom fluid.
External factors - Factors Controlling Metamorphosis in Insects In few cases an external factor may be accountable for initiating moulting, as for instance in the blood su
Q. What do you understand by Pericardium? Pericardium is the covering sac of the heart. The pericardium prevents acute cardiac chamber dilatation. Acute pericarditis, pericardi
Biochemistry : The chemistry of living organisms that covers all the chemical reactions occurring in our body.
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Define the Disorders due to the iodine deficiency? Mild goitre, i.e., a larger thyroid gland than normal. The mildest form of goitre ranges from those only detectable by to
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Q. How is reproduction done in beings of the class Reptilia? These beings reproduce sexually through internal fecundation by means of copulation between female and male individ
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Q. Can the amount of available energy in a given trophic level be larger than the available energy in inferior trophic levels? What does that condition means to the conformation of
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