Which question is testable? OA
How does changing the amount of water affect the growth of corn?
O B.
Is it ethical to use human tissue removed during surgery for scientific research?
©C.
Are you happy with your new job?
O D. Will people be disappointed if car insurance rates increase?
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A.) How does changing the amount of water affect the growth of corn?

Explanation:

A seems to be the most testable question since you can't reasonably test if using human tissue that was removed for surgery is ethical or not, being happy or unhappy with a new job doesn't require a test, and asking if people will or will not be disappointed with an increase in insurance rates should be enough, no test required.

Regards!

1. loamy sand is about 80% sand with 10% clay and defined mostly by sand particles with some clay to provide structure and fertility. the sand particles are easily visible and the soil holds structure but breaks apart easily.

2. scott sand can improve his soil quality by incorporating more silt and organic matter into the soil. peat moss and organic matter can also be incorporated.