The process of protein turnover includes:
a. excreting old amino acids that are left from cell breakdown.
b. synthesizing intestinal cells, which live for 3 to 4 months.
c. eating food sources of amino acids every day to grow new cells and replace worn-out ones.
d. preserving all old amino acids in the body to be re-circulated.
e. circulating proteins in the bloodstream to replenish peptide chains.

c. eating food sources of amino acids every day to grow new cells and replace worn-out ones.

Explanation:

Proteins are one of the macromolecules present in cells to serve both structural and functional roles. Cells continuously form new proteins to replace the worn-out ones. Proteins are polymers of amino acids. Many amino acids are synthesized in cells while the food we eat serves as a source of essential amino acids that cannot be formed in the body.

Digestion of proteins present in the food item releases the amino acids that become part of the amino acid pool of the cell. These amino acids serve as a monomer for protein synthesis. This process of protein synthesis and protein breakdown is called protein turn over.

relative dating involves things like higher layers are most recent than rocks lower in the sequence. this can be extended to the known sequence of fossils. rocks containing rabbit fossils are later than those containing dinosaur fossils.  

absolute dating methods mainly use radioactive elements that have known rates of decay and produce recognizable products. for example potassium 40 decays to produce argon. once a rock has solidified the argon is trapped. by measuring the argon and potassium0 you can get an accurate number for the age.  

some other methods are good for archaeological ages. dendrochronology involves recognizing the sequence of tree rings. the orientation of magnetized particles in baked clay can be used to date a fire.

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answer: accepted answer: aquatic animals use the oxygen dissolved in water to carry out respiration. since the amount of dissolved oxygen in water is low as compared to the amount of oxygen in the air, therefore the rate of breathing in aquatic animals is much faster than it is in terrestrial animals.

explanation: