Structure of typical viruses, the smallest microbe on Earth. Virus is merely a packet of DNA or RNA information. This packet of information is sort of like an instruction manual on how to reproduce. Read more: http://easyscienceforkids.com/viruses-the-smallest-microbe-on-earth/
Mitochondria are shaped perfectly to maximize their productivity. They are made of two membranes. The outer membrane covers the organelle and contains it like a skin. The inner membrane folds over many times and creates layered structures called cristae. The fluid contained in the mitochondria is called the matrix.