Answer:
D. Cell
Explanation:
Cells are the structural and functional unit of life. Cells are made up of various organelles, the liquid cytosol and nucleus in the case of eukaryotic cells. Biomolecules such as carbohydrates, lipids, proteins, etc. form various cell organelles. However, cells have level has emergent properties, the features that are not found at lower levels. For instance, cells are able to perform the life processes and distinguish the living things from non-living ones.
