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Q. How are the nervous and the symmetry system characterized in echinoderms?
Adult echinoderms, along with cnidarians, are the animals that present radial symmetry that is their body structures are distributed around a center. The radial symmetry in echinoderms however is a secondary radial symmetry, since their larval stage has bilateral symmetry and the radial pattern appears only in adult individuals there are some few adult echinoderms with lateral symmetry. All other animals have lateral symmetry with exception of poriferans no symmetry is defined for them.
Echinoderms do not present cephalization and they have a diffuse network of neurons and nerves made of a neural ring around the mouth and of radial nerves that ramify to follow the pentaradial structure of the body.
Doppler echocardiogaphy is based on the Doppler effect, which was described by the Austrian phy$icist Christian Doppler in 1842. The Doppler effect states that sound frequency
#question.give the classes of protozoa phylum in detail with examples .
V apour Theory (i) It was proposed by a Greek philosopher Pythagoras in 500 B.C. (ii) Each organ of an animal body emitted some kind of vapour and that a ne
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Q. How the DNA nanoarchitecturing works? DNA Nano architectures constructs that can be self-assembled from branched DNA molecules. Their components can be simple branched speci
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Which of the following serves as an effector, or as part of an effector, that functions in a negative feedback system? A. Glucagon Receptors in the plasma membranes of alpha-is
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Explain Diagnostic Approach to Congenital Heart Disease ? It is often easy to recognise the presence of CHD in older children and adults. As in any other form of heart disease
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