Lacks membrane-bound organelles. Found in protists, plants, fungi and animals. Subdivided by internal membranes into different functional compartments called organelles including a nucleus. Though structurally different, eukaryotic and prokaryotic cells have many similarities especially in their chemical processes. In living organisms there is a correlation between form and function.
Biological structure gives clues about what it does and how it works.
Knowing a structure's function gives insights about is construction. This correlation is apparent at many levels of biological organization. Use DNA as an example. The Interaction of Organisms with their Environment Organisms interact with their environment, which includes other organisms as well as abiotic factors. Both organism and environment are affected by the interaction between them.