In the field of histopathology, the tissues to be observed under the microscope are cut in very thin slices. The thin slices make the tissue transparent, and thus, it becomes easier to observe the internal structures and accurately diagnose a disease. The tissues slices cut for the observation are generally not more than 3 micro meters in their thickness.
Hence, the answer is 'to make the tissues transparent and easier to observe'.
Answer: Most of the beetles will be brown because they have a higher likelihood of reaching reproductive age.
Natural selection is the process of selection by nature in which an individual organism exhibiting more favorable phenotypic characteristics has more chances of survival and reproduction in it's corresponding environment.
In the new environment, brown beetles can camouflage themselves from predators better than the green beetles and blue beetles can. This is because of the fact that brown color of beetle is a better phenotypic trait which favors the survival of brown beetles over green and blue color. Therefore, the survived brown beetles will reproduce and grow in number.
Answer: One of the characteristics used to place organisms into kingdoms is their ability to make food. Other characteristics used are the cell structure that is whether prokaryote or eukaryote, absence or presence of cell wall, presence or absence of other organelles, cellularity may also be used such as whether unicellular or multicellular, and lastly the mode of nutrition such as whether heterotrophs or autotrophs, e.t.c