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).

B, C, E, A.

Explanation:

the tricuspid valve is present between right atrium and right ventricle

the correct answer is - d. china has a large and growing population.

the fact that china has a large (the biggest) population, and it is still growing, doesn't hinder the agriculture production in the country. in fact, it can for increased production in the agriculture, since there's more labor force, as well the sheer mass of people produces lots of scientists that come up with new inventions as to how to improve this sector. nice example is the inner mongolia region in china, in general dominated by the gobi desert, but few scientist came up with a nice idea as to how to make the region productive by using plants that are very resistant to droughts, so lots of people have been employed, and the region is becoming greener and greener each year, and the production of food in this region is also increasing.