For the first question, the age of each strip of rock is needed to determine the rate of seafloor spreading. The answer is B.
For the second question, the answer is A.
These microbial infections that are acquired by hospital patients as they are being used as the compromised host are the nosocomial infections. These type of infections are primarily caused by bacterial pathogens entering the patient's body and mainly causes urinary tract infection, pneumonia, and other illnesses.
Answer:
Option C “the reason the data are collected”
Explanation:
The epidemiology studies based on four criteria for utility of data are
1-Nature of data
2-Availability of the data
3-Completeness of data and
4- value and limitation.
Value and limitation of data means that some factors may limit the data usefulness like incomplete information or repetition and duplicate data while Nature of data means the data source which affect the statistical analysis. Availability of data means the presence or access of data to investigators.
