Which statement is true of producers? a. They fix most of the nitrogen in ecosystems.
b. They consume most of the biomass in ecosystems.
c. They produce most of the carbon dioxide in ecosystems.
d. They provide most of the energy in ecosystems.

Cell division is important to single celled organisms because it allows the cells to reproduce. through cell division, cells make exact copies of themselves. when single celled organisms go through cell division, they make exact copies of themselves which is how they reproduce.

It is called the medulla oblongata or people usually call it medulla. it is the lower half of the brain stem continuous with the spinal cord.