To see if breast-feeding influences the incidence of the disease rickets, researchers study rates of breast-feeding of infants with and without rickets. This is an example of
A. experimental research.
B. observational research.
C. epidemiological research.
D. double-blind placebo-controlled research.
Question 2
It is very important in a double-blind, placebo-controlled study that all of the factors that could influence the study results are
A. completely different for the groups of subjects.
B. equal and opposite for the groups of subjects.
C. kept to a minimum.
D. kept the same for the groups of subjects.
Adult European beewolf (Philanthus triangulum) feeding on nectar
The breast, cutaway view showing both internal and external features.
breast anatomy 2
The fight against breast cancer.
Hannah Höch, Study for "Cut with the Kitchen Knife Dada through the Last Weimar Beer Belly ...
Alcoholic Liver Disease