<span>The form of coal that is relatively abundant and most widely used is:
a. bituminous
</span>
Circadian rhythm I believe.
All cells share four common components:<span>a plasma membrane: an outer covering that separates the cell's interior from its surrounding environment.cytoplasm: a jelly-like cytosol within the cell in which other cellular components are found.DNA: the genetic material of the cell.<span>ribosomes: where protein synthesis occurs.</span></span>
Answer:
Cell differentiation is how cells become specialized. This occurs through a process called gene expression. Gene expression is the specific combination of genes that are turned on or off (expressed or repressed), and this is what dictates how a cell functions.
