Stem cells provide new cells for the body as it grows, and replace specialised cells that are damaged or lost. They have two unique properties that enable them to do this: They can divide over and over again to produce new cells. As they divide, they can change into the other types of cell that make up the body.
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Answer:
Amino acids and nucleotides
Explanation:
Amino Acids -
Amino acids are organic compounds that mix to create proteins.
Nucleotides -
A nucleotide is an organic molecule that's the building block of DNA and RNA.
A, I believe. Because after collecting you need to analyze in order to do many other steps. Also all the other answers are something before collecting data
