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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.
What are the two main classes into which fishes are divided? Fishes are separated into two main classes: chondrichthyes, fishes with cartilaginous skeletons (sharks, rays, dog-
Why would we evolve so that when we are stressed our immune system is suppressed? How would this increase survival?
Ears We have a pair of ears. Each ear has three parts - external, middle and inner ear. The function of the middle ear is transmission of sound waves from external to inner ear
Determine the Fransworth 100 Hue Panel Test This is a simple and useful test using colour chips arranged in a particular sequence. Colour deficient patients make errors in arra
general chARACTERS OF PORIFERA
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explain pcr
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Benefits of Hand washing You wash hands as a routine in daily life before cooking and eating food, after using wash room/toilet, before touching and caring a new born baby, aft
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