Final answer:
The most complicated entity among atoms, molecules, organelles, and cells is the cell, as it is the smallest independently functioning biological unit that can carry out life processes and is composed of organelles, molecules, and atoms. therefore correct option is D
Step-by-step explanation:
The most complicated entity among the given options is d) Cell. This is because a cell is a complex structure that can exist independently and is the basic unit of life. Within its confines, it carries out various life processes such as metabolism, growth, and reproduction. A cell is made up of various organelles (e.g., nucleus, mitochondria), which perform specific functions necessary for the survival and proper functioning of the cell.
Each organelle, in turn, is composed of molecules, and molecules are made up of atoms. If we consider the hierarchy of biological organization, the complexity increases as we move from atoms to molecules, from molecules to organelles, and from organelles to the cellular level.
The hierarchy of biological organization can be illustrated with the following sequences, indicating the increasing complexity of structures:
hydrogen atom,
water molecule,
skin cell,
liver (organ),
elephant (organism),
wolf pack (population),
tropical rainforest (ecosystem),
planet Earth (biosphere).