How does the kidney help with excretion

Explanation:

When working correctly, the kidneys filter blood to remove waste products from the body. The kidneys create urine, which carries the waste products down each linking tube to the bladder. Urine then passes through a tube called the urethra when a person urinates, expelling it from their body.

c.) polymerase chain reaction

- "unlike the original dna fingerprinting method, dna profiling does not use restriction enzymes to cut the dna. instead it uses the polymerase chain reaction (pcr)? to produce many copies of specific str sequences. pcr is an automated procedure that generates lots of copies of a specific sequence of dna."