50 pts some research suggests that individuals who take both vitamin c and zinc at the onset of the common cold experience fewer cold symptoms and recover more quickly than individuals who do not take these nutrients. what is the best explanation of why vitamin c and zinc could reduce the intensity and duration of the common cold? a. both vitamin c and zinc are involved in wound recovery. b. vitamin c and zinc are required for the absorption of iron, which is needed by the immune system. c. vitamin c and zinc are required for the absorption of vitamin k, which is needed for wound recovery. d. both vitamin c and zinc are involved in immune system functions.

Option (D).

Explanation:

Vitamin C is a vital nutrient, required for proper body functioning, including immune responses. It is found in high concentration in immune cells, antimicrobial activities, and promotes proliferation of lymphocytes that play role in elimination of pathogens.

Zinc also plays role in maintenance of a functioning immune system as it affects the rate of replication and cell division in the cells.

Both vitamin C and zinc are potential antioxidants, which provide a increases level of protection against common infections by improving functioning of immune system.

Thus, the correct answer is option (D).

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.

hope this .. .

47

explanation:

ok