How can a scientist know if what he/she is looking at, under the microscope, is in fact a cell? what can mislead us to think we are looking at a cell but in fact we are looking at non-living structures of about the same size?

Which of the following observation darwin shape his concept of descent with modification? a) species diversity declines farther from the equator. b) fewer species live on islands than on the nearest continents. c) birds live on islands located farther from the mainland than the bird's maximum nonstop flight distance. d) south american temperate plants are more similar to the tropical plants of south america than to the temperate plants of europe. e) earthquakes reshape life by causing mass extinctions.