The bottom of the pyramid.
Answer:
cell
Explanation:
cell is functioning and structural unit for all living organisms.. they have their own different functions
Oil-immersion objectives are limited to use with coverslip-prepared samples, since they don't have enough working distance to focus through the 1 mm or thicker plastic wall of a typical cell culture vessel.
Answer:
Kitten
Cactus
Mushrooms
Bacteria
so all but Rock
Because only living things have cells