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Q. What are age pyramids?
Age pyramids are the graphical representations in form of superposed rectangles each representing the number of individuals included in age ranges into which a population is divided. In general the lower age ranges are represented more to the bottom of the pyramid, always below higher ranges, and the variable dimension that represents the number of individuals is the width (there are age pyramids however in which the variable dimension is the height).
Marine Animals The composition of body fluids of marine invertebrates, including the ascidians are similar to seawater. Such animals need not expend much energy in regulating
Which of the following is true for a toe motor neuron that excites a toe muscle that moves the big toe in the right foot? A. The cell body of the toe motor neuron is located in
How do genetic mutations influence biological diversity? Too frequent or too extensive genetic mutations usually are deleterious for individuals and species. These mutations fr
Q. Concerning permeability what type of membrane is the cell membrane? The cell membrane is a selectively permeable membrane that is it allows the passage of water and some sel
This is concerned more with nature's services which also make vital contributions to the welfare of society and to ecological processes without which our planet would be uninhabita
COMPOSITION OF CELL WALL Cell wall composed of cellulose, hemicellulose, pectin, lignin, cutin & chitin. Cell wall consists of 3 parts - 1. Matrix Highly cross-
What is the Determination of vitamin B 1 Vitamin B 1 is determined by chemical method and microbiological assay. In the chemical method, vitamin B 1 is oxidized in alkaline
VACUOLES Some animals cells may have one to a few small fluid filled vacuoles.. Plants cells in general possess one or a few large vacuoles. Vacuoles of animals cells
How do homeotic genes regulate development in Drosophila? Homeotic genes code for regulatory proteins that are thought to control the rate of cell division in various body area
MODIFICATION OF MITOSIS 1 . CRYPTOMITOSIS OR PROMITOSIS : Primitive type of mitosis. In this mitosis nuclear membrane not disappear (remain intact throughout the div
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