A hexahedron (plural: hexahedra) is any polyhedron with six faces. A cube, for example, is a regular hexahedron with all its faces square, and three squares around each vertex. There are seven topologically distinct convex hexahedra, one of which exists in two mirror image forms.
Some bacteria that can help the environment are called decomposers. They are nature's recyclers! They return basic chemicals to the environment for living things to reuse! For example, the leaves of many trees die in the Autumn and drop to the ground.ome bacteria that can help the environment are called decomposers. They are nature's recyclers! They return basic chemicals to the environment for living things to reuse! For example, the leaves of many trees die in the Autumn and drop to the ground.
Bacterial cytoplasm is surrounded by a cell membrane, and a cell wall. The cell membrane is similar to that of eukaryotic cells. The cell wall maintains the shape of the cell. The DNA of a bacterium is a single circular chromosome that resides in the nucleoid. The cytoplasm of a bacterium has thousands of tiny particles called ribosomes that make all of the proteins needed by the cell. Bacteria can have appendages with specific functions.