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.
the excretory system. the kidney produce more concentrated urine so less water is lost from the body. sweat help maintain your body's natural temperature.
Hello, these are called afferent pathways and efferent pathways.
Sure hope this helps you.<3
