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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.
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what is the full name of Balfour in Balour''s law of cleavage?
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One can verify the age of an oak tree by counting the annual rings of formed by the. a. primary xylem, apical meristem b. secondary phloem, vascular cambium c. dermal
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