Most living beings cannot use molecular nitrogen to obtain nitrogen atoms. Producers fix nitrogen mainly from nitrate (NO3-). Some plants also fix nitrogen from ammonia. Consumers and decomposers acquire nitrogen through digestion of mainly proteins and nucleic acids from the body of other living beings.
Fixation is the process by which the structures of the cells are preserved and fixed in position. An advantage of chemical fixation over heat fixation is that it A) magnifies the specimen B) does not destroy internal structures
The substage condenser A) changes the wavelength of the light reaching the specimen B) focuses light on the specimen C) decreases the amount of light reaching the specimen
A 40X objective and an 10X ocular produce a total magnification of A) 50 B) 400 C) 90
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