The carbon dioxide is moving out of the living things
Answer:
The answer is when the cell express different genes.
Explanation:
Cell differentiation is the process when a cell is changed from one cell type to an other and brings more complexity to the system. A cell before differentiation possess all the genes however their expression in turned off. When some external or internal factors trigger the gene expression it starts the cell differentiation. A multicellular organism undergoes several rounds of cell differentiation during its development. Although cell differentiation changes the size, shape and metabolic activity but the genetic makeup or DNA is never changed during cell differentiation.
Most data collection can be graphed (occasionally a table is more appropriate). Graphs quickly reveal progress or lack thereof. They allow for evaluation of hypotheses as to what happened (or didn't). Small variations in behavior are normal. Judge progress based on viewing multiple data collection periods (that might mean, for example, looking at a week's worth of data, graphed by days).
