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EXTINCTION -
It refers to disappearance of a species from earth when its last surviving member dies.
Organic evolution not only creats new sps. but also eliminates some old ones.
Many sps. become extinct before man appeared as ostracodermi & dinosaurs.
What is Diatoms? Bacillariophyta are commonly known as diatoms because of their unique structure. These unicellular photosynthetic organisms are composed of two overlapping glas
Q. What are the morphological, chemical and functional similarities and differences between peroxisomes and lysosomes? Similarities: Peroxisomes and lysosomes are small membran
Locomotion in Echinodermata Locomotion in echinoderms is accomplished through a unique canalicular system which is termed as the water-vascular system. This system is charact
HOMOPO L YSACCHARIDE S (= HOMOGLYCANS) These are complex carbohydrats that are formed by repeated condensation or polymerisation of only one type of monosaccharide monome
Which is plant tissue responsible for the filling of the space between other tissues? Plant-filling tissue is basically called as parenchyma and the plant parenchyma can be div
Explain the Estimation of Inorganic Phosphorus? Most methods estimating inorganic phosphorus use the reaction between the phosphate and an acid molybdate. The hexavalent molybd
Why in some cases is mitosis a synonym of reproduction? In some living beings asexual reproduction happens by many means: binary division, schizogony, budding, grafting, etc. I
how do viruses reproduce
Altitudinal Variations We know that temperature decreases with increasing altitude. This is mainly due to convection currents in the troposphere - the lowermost (and most dense
Concept behind Freezing the milk Freezing the milk also alters its composition and properties to a great extent. Let us learn about these changes. As the milk freezes, it becom
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