Answer:
hi what is your question?? say in English please
The CNS (Central Nervous System) consists of the brain and spinal cord.
Pure substances can be elements made up exclusively of one kind of atom, or they can be compounds made up of molecules that include two or more elements. Mixtures can be homogeneous or heterogeneous depending on how finely mixed the components are.
The answer is b no problem
A. cleaning up after environmental disasters
