"A cell is generally defined as a single unit or compartment, enclosed by a border or wall, which is usually part of a bigger structure. In biological terms, cells are the structural and functional units of all living organisms. Living cells illustrate overwhelming evidence of intelligent design due to their many irreducibly complex molecular machines. Cells are so tremendously complicated that we are only beginning to understand their internal workings, and indeed many functions within the cell still remain a total mystery.
Some organisms, such as bacteria, are unicellular, consisting of a single cell. Other organisms, such as humans, are multicellular, or have many cells—an estimated 100,000,000,000,000 cells! Each cell is an amazing world unto itself: it can take in nutrients, convert these nutrients into energy, carry out specialized functions, and reproduce as necessary. Even more amazing is that each cell stores its own set of instructions for carrying out each of these activities.
In the early twentieth century, the cell was viewed as essentially a blob of protoplasm. It was simply an unobservable collection of gelatin molecules, the inner workings of which were not yet understood. On the other hand, 21st century technology reveals that although the tiniest bacterial cells are incredibly small, weighing less than 10-12 grams, the entire cell is incredibly integrated and each part works as part of a team.
An analogy sometimes used, is the comparison of a cell to a city. For instance, the workers can be compared to the protein, the powerplant to the mitochondria, the roads to the actin fibres and microtubules, the trucks to the Kinosin and Dynein, the factories to the ribosomes, the library to the nucleic acid, the recycling centre to the Lysosome, the police to the chaperones, and the post office to the golgi apparatus.
As technology increases, science continuously opens black boxes within already opened ones, and as more and more of these are being exposed, the phenomenal complexity of the whole system pushes evolutionary theories to breaking point."