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Excretion in Animals
Excretion is concerned along with the removal of metabolic wastes that arise as a result of oxidation of energy rich compounds and metabolism of proteins and nucleic acids. This is performed in non-chordate metazoan animals through two distinct sets of tubular structures - the nephridia and coelomoducts. The nephridia and coelomoducts are variously named in different groups of animals depending upon their complexity and location. Terrestrial arthropods have evolved another kind of excretory organ known as Malpighian tubules structurally different form nephridia and coelomoducts.
Demographic Transition As we saw earlier, death rates and birth rates have been nearly equal throughout much of human history. However, in Western Europe, death rates began to
locomotary organ in mollusca
How are human voices created? Human voice is formed with the help of muscles in the neck and the vocal cords. The tighter the vocal cords the higher the pitch of voice. This is
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The passive transport of molecules across a membrane does not require an input of metabolic energy. Rate of the diffusion or transport is proportional to the concentration gradient
What are the three categories in which food protein sources can be divided into Protein food sources can be separated into the following three categories: Proteins of pl
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