please help i am cunfuseled! Students examined the smaller structures of living things and non-living things. Which of the following observations provides evidence that the smaller parts of living things, and not the non-living things, are cells? Smaller parts of living things– A are tightly packed together with almost no space between them. B carry out functions that sustain life such as respiration. C are uniform in size and structure. D cannot be seen with the unaided eye but require a microscope.