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What is the evolutionary importance of pteridophytes?
As the first tracheophytes, pteridophytes were also the first plants to extensively colonize the terrestrial environment forming forests. They also constituted an significant source of food for terrestrial animals. By presenting conductive vessels they could be larger, a feature inherited from them by phanerogamic plants.
Of which cells is the nervous tissue constituted? How is the generic function of this tissue related to the characteristics of the main cell type that forms it? The nervous tis
Determine the Principle of Brain and Behaviour A second principle is that insight into children's adaptation can be gained through an analysis of brain behaviour relationships.
Name the corrosion resistant metals Most of the corrosion resistant metals or alloys used for implants have a layer of oxides on their surface. The thin (approximately 5 nm) la
Oxygenator : They serve the function of lungs during extra corporeal circulation (ECC) - Oxygenation, removal of carbon dioxide and transport of gaseous anaesthetic agents:*The o
Earthquake creates seismic waves that travel through and around the surface of the earth. Seismic waves are the waves of energy caused by sudden breaking of rocks during an earthqu
Stretch Receptors Stretch receptors able of perception of muscle tension or stretch are distributed in the connective tissue related with muscles of many groups of animals. Th
(a) What effect does alcohol have on reaction time? (b) What other short-term effects does alcohol have? (c) What long-term effects can result from an exce
Why plant nutrients said to be essential An element is said to be essential if, (i) The deficiency of an element in plant, makes it impossible to complete the vegetative
Hydrogen Transferring Coenzymes This group consists of three important coenzymes all of which assist different enzymes in oxidation-reduction reactions. These are: a
Properties of Stem Cells Stem cells are defined by having 3 major properties: 1) They are capable of self-renewal. 2) They divide, some daughter cells give rise to cells
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