You are investigating the role of physical activity in heart disease, and your data suggest a protective effect. whilepresenting your findings, a colleague asks whether you have thought about confounders, such as factor. under which ofthe following conditions could this factor have confounded your interpretation of the data? a. it is a risk factor for some other disease, but not heart disease. b. it is a risk factor associated with the physical activity measure and heart disease. c. it is part of the causal pathway by which physical activity affects heart disease. d. it has caused a lack of follow-up of test subjects. e. it may have blinded your study.

option E - It may have blinded your study.

Explanation:

A confounder is a factor, in data analysis, that causes the effects of two distinct processes to be indistinguishable/ unknown.

Of course, the confounder (factor) could have made the protective effect against heart disease a function of more than just physical activity - bringing other factors like heredity or diet history etc into consideration.

So, the confounder (factor) may have blinded your study.

format change of dna.  

hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds