Researchers studied 208 infants whose brains were temporarily deprived of oxygen due to complications at birth. when researchers detected oxygen deprivation, they randomly assigned babies to either usual care or to a whole-body cooling group. the goal was to see whether reducing body temperature for three days after birth increased the rate of survival without brain damage. what is the explanatory variable? (i) infants whose brains are temporarily deprived of oxygen (ii) usual care or whole-body cooling (iii) survival without brain damage

(ii) usual care or whole-body cooling

Explanation:

In an experiment there are several types of variables that interact with each other to establish a possible result for a research being done. An example of this are variables called explanatory, which can also be called independent. This type of variable does not influence the other variables and determines what will be the result of the research through this influence. In the case set out in the question above, we can see that the usual care or full-body refrigeration of babies is what will determine the research outcome, so we can conclude that "usual care or full-body refrigeration" is the explanatory variable.