When doing medical research with human subjects, which four limitations are unavoidable? A. It’s often impossible to repeat trials on the same subjects.

B. Subjects may report an inaccurate medical history.

C. It can be difficult to control all possible variables.

D. It’s impossible to come up with testable scientific questions for human subjects.

E. There are ethical or privacy concerns to consider.

Will give brainliest pls help ( I don't know whether B or D are the incorrect answers).

The dna in a cell’s nucleus encodes proteins that are eventually targeted to every membrane and compartment in the cell, as well as proteins that are targeted for secretion from the cell. for example, consider these two proteins: phosphofructokinase (pfk) is an enzyme that functions in the cytoplasm during glycolysis. insulin, a protein that regulates blood sugar levels, is secreted from specialized pancreatic cells. assume that you can track the cellular locations of these two proteins from the time that translation is complete until the proteins reach their final destinations. for each protein, identify its targeting pathway: the sequence of cellular locations in which the protein is found from when translation is complete until it reaches its final (functional) destination. (note that if an organelle is listed in a pathway, the location implied is inside the organelle, not in the membrane that surrounds the organelle.)

Plz ! ive been stuck on this forever

What best describes the dropping height of a ball that bounces back up to a height of 45 cm