Dad says to Junior, "Hand me the screwdriver." Junior responds with, "Which kind, a flat-head or Phillips?" Which language barrier is Junior trying to overcome?

Failure to be specific

Explanation: Junior was trying to overcome failure to be specific language barrier, Dad was not specific about the kind of screwdriver he wanted. Language barriers are the most common communication barriers which can cause misunderstandings and misinterpretations between people, as it is seen between Dad and junior. Junior was trying to understand what the father is trying to communicate in particular hereby prompting him to ask that question (what kind) in other not to misunderstand his dad.

answer; a team- maintenance role;

it might look like that the ideal way to research the health effects of trans fats is through a controlled experimental feeding trial. but these kinds of trial have several important limitations that the researcher must look into:

short in duration (this factor usually checks up on the intermediary risk factors rather than the actual outcomes of the disease)

limited dietary changes

only makes use of healthy participants