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 cells. Structure of a salmonella bacterium cell. A bacterium is a single-celled organism [organism: A living being-plant, animal, fungus or bacterium. ] . A bacterial cell has a different structure to an animal or plant cell.tructure of a salmonella bacterium cell. A bacterium is a single-celled organism [organism: A living being-plant, animal, fungus or bacterium. ] . A bacterial cell has a different structure to an animal or plant cell.