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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.
Closed Type of Circulatory Systems Some non-chordates, like cephalopods (octopuses, squids), earthworms, polychactes and all vertebrates have a closed circulation along with b
Individual components of biodiversity provide an unbeliev able wide range of products that are used to enhance the lives of people in all countries of the world. It is the diversit
BRONCHOSCOPY: Bronchoscopy is the passage of lighted bronchoscope into the bronchial tree. Bronchoscopy may be performed with rigid steel of flexible fiberoptic instruments.
How has the importance of the brain evolved from fishes to reptiles? From the least to the most difficult brain structure, it is evident that the brain, from fishes to beings o
components of human skeleton
Q. How is carbon dioxide made by producers and consumers? The Carbon dioxide is made by consumers and producers through cellular respiration.
Most of the water taken up by a plant passes through it and is evaporated to the atmosphere. What use is made of the tiny fraction of this water which is retained by the plant?
Alterations occuring in cereal & cereal products, legumes You are already aware of the chemical composition of cereals and pulses. We will now look into changes occurring in t
1. This is very prolonged phase, and differs from the prophase of mitosis, because in this Chromosomes behave as homologous pairs. 2. Each diploid cell has two chromosomes of ea
Are mollusc metameric beings? Exclusively analyzing this feature could it be said that molluscs are evolutionarily proximal to nematodes or to annelids? In molluscs there is no
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