Define closed circulatory system
Define closed circulatory system?
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A closed circulatory system is one in which blood circulates merely within blood vessels. For this reason the blood pressure is more in animals with closed circulatory system. The cellularity of the blood is too higher with numerous specific blood cells.
The closed circulatory system is a characteristic of annelids, cephalopod molluscs and vertebrates.
Illustrate the meaning when it is stated that beings of the phylum Annelida are vascular beings? From which phyla of the animal kingdom does this feature distinguish them?
Explain the endocrine function of placenta? Briefly explain it.
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Explain the structure of adult fern where cells which are undergoing the meiosis can be found?
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How is extracellular digestion associated to tissue and cellular specialization?
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