Answer:
Kidney
Explanation:
The kidney is the body system that regulates the acid base balance of the blood.
Only after an experiment has been run over and over again to
1. replication
2. four genetically identical cells
Answer:
Explanation:
Nucleotides are building blocks of nucleic acids (DNA and RNA). A nucleic acid contains a chain of nucleotides linked together with covalent bonds to form a sugar-phosphate backbone with protruding nitrogenous bases. For example, DNA contains two such chains spiraling round each other in the famous double helix shape.