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How old is the universe?
From the analysis of data collected by the Hubble telescope the age of the universe is estimated to be about 12 billion years.
Q. What is the main nitrogen waste of humans? Human beings excrete largely urea eliminated with the urine.
NE R V OU S TISSUE The nervous tissue in general develops from the ectoderm of the embryo, but the microgliocytes. It does not have a matrix. The special properti
Q. Why are some kinds of hemorrhagic diseases caused by genetic or acquired deficiency of the vitamin K metabolism? Deficiency of vitamin K predisposes to hemorrhages since thi
Group specificity Some enzymes prefer a specific functional group to be present\%on the substrate molecules. Example:- alcohol dehydrogenase acts on alcohols having -OH gr
Nitrogen is needed mostly for the synthesis of amino acids and nucleotides. Sources of nitrogen can be obtain from organic as well as inorganic sources, but the whole target is the
Food Chain - Ecosystem In a food chain, the food energy is transformed from a given source through a series of species, each of which eats the one before itself in the chain.
Reed-Swamp Stage - Hydrarch This stage is also known as amphibious stage, as the plants of the community are rooted but most parts of their shoots remain exposed to air. Speci
Particulate Theory (i) Maupertuis (1689-1759) proposed that the body of each parent give rise to minute particles. (ii) In sexual reproduction, these particl
HOW MANY PHYLUM OF ANIMALS?
What is the importance of vitamin A The importance of vitamin A is undisputable. You may already be aware about the functions/role of vitamin A in our body. Vitamin A is absol
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