Answer:
b and idk how to explain it sorry i just know the answer my aunt is a doctor
Explanation:
Drug allergies would need to be avoided in the future and drug interaction is when someone cannot tolerate the side effects
Calcium and phosphorus build strong and flexible bones. A diet lacking these nutrients can lead to osteoporosis.
Answer:
Questionnaires
Explanation:
They allow both government and outside researchers to obtain estimates of a variety of health related topic or issue among either the entire nation or specific demographic group of the population.
And the survey design is cross section.
