How would the experiment need to be modified in order to determine whether the amount of vitamin A absorbed by the body is dependent on the amount of beta carotene consumed?

There should be more groups of subjects, each consuming a different quantity of beta carotene.

Explanation:

For them to determine whether the amount Vitamin A absorbed by the body is dependent on the amount of beta carotene consumed, what they need to do is to create more groups each consuming a different amount beta carotene by so doing, they have been able to modify the experiment to determine whether the amount of vitamin A absorbed by the body is dependent on the amount of beta carotene consumed.

The experiment should have more different subject groups, with each group consuming a different amount of beta carotene.

Explanation:

When designing an experiment, to determine the effect of the amount of a substance, the experimental design should be done to accommodate more than two experimental group with each group treated with different amount of the substance and also a control group. This will enable the researcher to determine the effect of the different ranges of amount.

In the example, in other to determine if vitamin A is dependent of the amount of beta carotene consumed, there should be more different subject groups, with each group consuming a different amount of beta carotene.