Respuesta :

ilardegwynesh

It's often impossible to repeat trials on the same subjects. 2-Subjects may report an inaccurate medical history. 3-It can be difficult to control all possible variables. 4-It's impossible to come up with testable scientific questions for human subjects.

haileymoreschini

Answer:

It’s often impossible to repeat trials on the same subjects.

Subjects may report an inaccurate medical history.

It can be difficult to control all possible variables.

There are ethical or privacy concerns to consider.

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