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Developmental Patterns - Metazoa
The metazoans or Animalia can be divided into two groups on the basis of body symmetry. The bilateral metazoans can be divided into two great assemblages: the Protostomia and the Deuterostomia.
Platyhelminthes, Molluscs, Annelida, Arthropods and a number of minor phyla are classified as Protostomes while Echinodennata, Chordata and at least two minor phyla are included in the deuterostomes. The features used to place animals in these groups are largely developmental.
In 1798, British economist and demographer Thomas Robert Malthus, published his' essay on population' in which he stated that: 1. Population increases in a geometric rat
Gill slits are the opening or the clefts between the gill arches in the fish. Water taken in by the mouth passes through the gill slits and bathes the gills. It also has rudimenta
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Wet Stigma - Category of Stigma Petunia shows several randomly distributed 2-celled papillae on its surface. In a developing stigma, the epidermis is covered by a continuous,
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Q. What is the difference between lungs and gills? Lungs and Gills are richly vascularized organs that serve for gas exchange between the environment and the circulatory system
Feed adulterants Adulteration of raw material is creating a serious problem for manufacturing the good quality feed as the trading of raw ingredients is totally in unorganized
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