Private child care is C.
Stay at home parent is A
Family member is B
Day care is D
A. The term salinity refers to the amount of dissolved salts that are present in water.
The answer is body's line of defense. The first line of defense which includes physical as well as chemical barriers would defend the body from infection. It would include the tears, cilia, stomach acid,urine, white blood cells,mucus and the skin. The skin is the largest organ and would act as a barrier from pathogens. If first line of defense won't work the second line will then be activated.
I think it is also all the above so D
