Answer: molecule, organelle, cell, tissue, organ, organ system, organism, community, population, ecosystem, biosphere
Explanation: In a living cell, a molecule is present in an organelle, an organelle is found in a cell, a collection of similar specialized cells forms a tissue, a collection of tissues forms an organ and a collection of organs forms organ system. A collection of these systems forms an organism which lives in a community which is a part of population that makes up an ecosystem that occupies the biosphere.
