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Search results 2481 - 2490 of 5332 matching essays
- 2481: Plants
- ... epidermis may contain stomata, openings through which gases are exchanged with the atmosphere. Specialized cells called guard cells, which, through changes in their size and shape, alter the size of the stomatal openings and in effect, regulate the gas exchange, surround these openings. The epidermis is covered with a waxy coating called the cuticle, which functions as a waterproofing layer and thus reduces water loss from the plant surface through evaporation ...
- 2482: The Beginning of the Universe
- ... average density of matter forever. There are observational evidences found that can prove the Big Bang model is more reasonable than the Steady State model. First, the redshifts of distant galaxies. Redshift is a Doppler effect which states that if a galaxy is moving away, the spectral line of that galaxy observed will have a shift to the red end. The faster the galaxy moves, the more shift it has. If ...
- 2483: Forests Cannot Absorb CO2 Emissions
- ... dioxide emissions. Environment ministers and experts from around the world will be meeting in Buenos Aries. There they will try to map a course for industrialized countries as they try to rein in emissions of greenhouse gases in line with the Kyoto treaty, signed last year. A new report tells people that one third of the world's forests are at dying risk because of climate changes. This new report tells ...
- 2484: The Downy Woodpecker
- ... flight that is most evident when it crosses open areas or swoops through woodlands. The dips are not as deep as those of a goldflinch, but as ornithologist Arthur Cleveland Bent said, "It gives the effect of a ship pitching slightly in a heavy sea. A few strokes carry the bird up to the crest of the wave~ the wings clapping close to the side of the body~ then, at the ...
- 2485: The Application of Fractal Geometry to Ecology
- ... animal ecology: dirty data and clean questions. pp. 559- 572 in Developments in Numerical Ecology. P. Legendre and L. Legendre, eds. NATO ASI Series. Vol. G14. Springer, Berlin. Turner, M. G. 1989. Landscape ecology; the effect of pattern on process. Annual Rev. Ecological Syst. 20:171-197. Vedyushkin, M. A. 1993. Fractal properties of forest spatial structure. Vegetatio. 113: 65-70. Voss, R. F. 1988. Fractals in Nature: From Characterization to ...
- 2486: The Praying Mantis
- ... legs have three parts: 1. The lower part of the legs or tibia have sharp spines to firmly grasp prey 2. These spines "fold-up" into matching grooves in the upper femur, creating a "jackknife" effect that allows the insect to assume its distinctive "praying" position. 3. Finally, the upper coxa functions like a shoulder to connect the femur and tibia to the mantid's body. 4. Four other long, thin ...
- 2487: Essay on Evolution
- ... may not be accurately represented in the next generation due to sampling error. Genetic drift usually occurs in small populations that contain less than 100 individuals, but in large populations drift may have no significant effect on the population. Another mechanism is gene flow which is when a population may gain or lose alleles by the migration of fertile individuals between populations. This may cause the allele frequencies in a gene ...
- 2488: Evolution From A Molecular Perspective
- ... to assist the creature with living in its new surroundings? "W. Bodmer suggested that once a large change in chemical affinities produced by one mutation had enabled a species to occupy a new environment, its effect might have been refined by later adaptive mutations, each contributing minor shifts, over a long period of time." ("Species Adaptation in a Protein Molecule", 22.) For example, did a llama's hemoglobin adapt to a ...
- 2489: Cloning Today
- ... organ could be cloned from someone matching the persons type. This way people would not need to wait for someone to die to find a replacement organ. These ideas have not been put into effect yet, but that does not mean that they are far away in the future. The ideas for cloning are infinite. There is no telling what the possibilities can be. Edward Squires, an equine reproduction biologist ...
- 2490: Bioethics
- ... not necessarily enforceable, strongly urge researchers experiments on human subjects to observe certain standards of conduct. A. FEDERAL AND PROVINCIAL LEGISLATION The Canadian Charter of Rights and Freedoms governs here. Some of its provisions in effect make certain kinds of experiments illegal. "Any experimental activity which endangers the protected values is thereof illegal."~ Another is according to current case law, "treatment" may be broadly construed rather than being limited to therapy ...
Search results 2481 - 2490 of 5332 matching essays
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