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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.
During chemical synaptic transmission A. neurotransmitter travels via diffusion in extracellular space. B. there will always be release of neurotransmitter from the postsyna
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Hepatitis A Hepatitis A vaccine (Havrix - GlaxoSmithKline; Vaqta Merck) is recommended for all susceptible travelers going anywhere other than Canada, Australia, New Zealand,
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Homo erectus first arose about 1.6 million years ago and is believed to have lived for atleast 600,000 years at a time when the transition to Homo sapiens took place. The fosSil fi
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