What does the salivary glands do for the digestive system?
A. It produce saliva, which keeps the mouth and other parts of the digestive system moist.
B. It produce moist, which keeps the mouth and other parts of the digestive system saliva.
C. It produces ptyalin to make saliva for the mouth, so the system can start.
Select your answer:
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DNA › ViewWhich of the following is the most complete and accurate description of mutation?
A. Three adjacent nitrogen bases of mRNA that code for an amino acid
B. The process of matching anticodon sequences in tRNA to mRNA codons
C. A spontaneous change in DNA that may lead to cellular malfunction
D. A biomolecule composed of amino acids connected by peptide bonds
Human Excretory System › View
What is the main function of the excretory system?
A. to collect and remove wastes from the body
B. to strengthen skeletal muscles
C. to protect the nervous system
D. to bring oxygen to body cells