We have to find the force of gravity of an object that has a mass of 20 kg and then to choose the correct answer. The formula for the force of gravity is: F = m * g, where m is the mass of an object and g is the acceleration of the gravity ( on Earth : g = 9.81 m/s^2 ). F = 20 kg * 9.81 m/s^2 = 196.2 N, or approximately 196 N. Answer: A. 196 N<span>.</span>
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The statement "<span>Bright-field microscopes are used for most microscopic work. " is true.
</span>Bright-field microscopy<span> is the simplest of all the optical</span>microscopy<span> illumination techniques. Sample illumination is transmitted (i.e., illuminated from below and observed from above) white light and contrast in the sample is caused by absorbance of some of the transmitted light in dense areas of the sample.</span>
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B is the right answer I think.
Answer:
continuous supply of oxygen to the cells. oxygen is extracted from the atmospheric air in the lungs, and carried by the bloodstream through the circulation to the tissue
