Helen is a researcher interested in topics such as cancer and heart disease. she wants her psychological research to address why some people get sick, how some people stay healthy, and what they do when they get sick in order to try to recover. helen is likely a

The correct answer is Health Psychologist.

Explanation:

Health psychology is the study of the psychological impact in health, in illnes and in healthcare, and the relation there's between the behavioral process in these three aspects mentioned above, it analyzes the phenomena that is the understanding that health is not only related to biological processes but also psychological, therefore Helen is likely a Health psychologist because that is the field of study of her psychological research, the impact of psychological aspects on health and diseases like cancer and heart disease.

productive most commonly means: achieving or producing a significant amount or result.

explanation:

productive can also mean:

these depend on how the word productive is used. most likely productive will mean   achieving or producing a significant amount or result.