Question

what does a pine tree, an octopus, and a bacterium have in common at the microscopic level?
nothing in common
nuclei
blood supply
cancerous tissues
cellular composition

Explanation:

Pine trees (plant), octopuses (animal), and bacteria are all living organisms. Bacteria are prokaryotes (no nucleus), so they lack nuclei; bacteria and pine trees have no blood supply; cancerous tissues are not a universal feature of these organisms. All are composed of cells (bacteria are single-celled, pine trees and octopuses are multicellular), so cellular composition is their shared microscopic trait.

Answer:

cellular composition