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.
Smaller cells have a large surface area compared to cell volume, while larger cells have a reduced ratio of surface area to volume. One reason why bacterial cells are so small is that they need a large surface area to cell volume to take in nutrients. Bacteria accumulate nutrients from the environment by diffusion.maller cells have a large surface area compared to cell volume, while larger cells have a reduced ratio of surface area to volume. One reason why bacterial cells are so small is that they need a large surface area to cell volume to take in nutrients. Bacteria accumulate nutrients from the environment by diffusion.