A researcher places participants into a scent-free room and releases a small amount of mint oil into the air. The researcher is trying to determine, for each participant, the smallest amount of mint oil that each participant can detect in the air, 50 percent of the time. The research is trying to determine

Determine the odour detection threshold of the research subjects

Explanation:

The research is trying to determine the odour detection threshold of the research subjects

Odour detection threshold is the lowest level of an odorous compound that can be perceived by the human sense of smell.

this can !    

- jack watson

two jet streams that directly affect the formation of weather in the continental part are a polar jet and a subtropical jet. they are responsible for the transportation of weather systems, which directly affect people. the polar front is the boundary between cold air from the north pole and warmer equatorial air. both the polar jet and the subtropical jet blow from the west to the east, and follow the boundary between cold and warm air.

the strongest jet streams are polar jets, while subtropical jets are somewhat weaker.

the right answer is c. the polar jet stream is generaly stronger than the subtropical jet stream.