The procedure for creating a DNA fingerprint consists of first obtaining a sample of cells, such as skin, hair, or blood cells, which contain DNA. The DNA is extracted from the cells and purified.
Answer: the tails are hydrophobic and the heads are hydrophilic
It is true because scientists often do that
it just as it is tempting to take natural selection to extreme so no not all
Since fire is a chemical reaction, and oxygen is needed for that reaction, having a fire in a cave is a sure sign of the presence of oxygen.