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!

cells use diffusion to get substances in and out of themselves. that diffusion will occur across the cell membrane or the outer covering of the cell. because we are talking about the surface of the cell, surface area and volume are  important factors here. as a cell increases in size, its surface area and volume increase as well.  we call that the surface area to volume ratio (sa: vol).  but the catch is that  volume increases at a greater rate than surface  area. in other words, as a cell gets bigger, the sa: vol gets smaller. so a really small cell like bacteria is mostly cell membrane (surface) with very little contents (volume). a really big cell like an egg, is mostly insides with a super thin membrane. so what ends up happening is that the cell cannot efficiently diffuse all of the stuff it needs in/out to survive. therefore cell size is limited to about 100mm. so how do we make organisms bigger than 100mm? cells divide! by dividing and becoming multicellular, organisms are able to grow!   check out the diagrams i attached to see the effect of sa: vol. i hope this ! good luck!