3. What is the purpose of the oil on the oil immersion lens? Oil provides a medium for the bacteria to float on the slide
O oil prevents light distortion and makes the images clearer
Oil is a lubricant and allows the objectives to slide easily
O oil prevents any water from seeping into the cover slip

correct answer is option a.

tropopause, stratopause and mesopause have all in common aspect that is point of maximum temperature in its layer of the atmosphere. all layers of atmosphere observe abrupt change in temperature. tropopause is the boundary between troposphere and stratosphere. stratopause is the boundary between stratosphere and mesosphere. mesopause is the boundary between mesosphere and thermosphere. these all boundaries are ranges between altitude of 0 to 80 km.

answer; the above answer to the above statement is (true)

c is the answer : )               your welcome