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Metazoan Branches
The Kingdom Animalia comprises all the multicellular animals (metazoans). These are divided into three branches:
The Mesozoa comprise a tiny single phylum (Phylum Mesozoa); the Parazoa comprise two phyla a tiny single phylum Placozoa and the rest make up the phylum Porifera comprising the sponges. Most of the metazoans come under the major branch Eumetazoa You must note that the cellular layers of Porifera (sponges) are not homologous to the germ layers of Eumetazoa. Their developmental pattern is also quite different from that of the Eumetazoa. The Parazoa are regarded as an early evolutionary side branch of the animal kingdom, which did not give rise to any other group of animals.
State the Layers of retina The retina is coil~posed of ten layers: a) Pigmented epithelium (outermost layer), b) Neusoepithelium, rods and cones (photoreceptors), c) Exte
In the preceding section we emphasised the fact that cvolution or the continuous adaptations to the environment can take place only when pheiiotypes exhibit variability. In the abs
what is a seed?
Diagnosis of lyme disease In endemic areas, Lyme disease is diagnosed by recognition of erythema migrans. IgG antibodies to B. burgdorferi are usually detectable 4 to 6 weeks a
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Explain the Urinary Excretion Test - riboflavin status? Urinary excretion of riboflavin is determined at different levels of intake. Under conditions of adequate riboflavin int
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Define Transport and uptake of Zinc by Cells? After absorption, zinc is bound to albumin and transported to the liver. In liver, it is concentrated and then transported to diff
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