Using improved chemistry equipment in the late 1700s, chemists observed that mass is neither created nor destroyed in a chemical reaction. this scientific law is called the law of
gravity.
definite proportions.
conservation of momentum.
conservation of mass.

nanotechnology is a powerful tool in biomaterials research as it creates numerous possibilities for the engineering of functional molecules. nano-bio refers to projected ability to incorporate biomimicry into various materials at nanoscale.  

the answer is option a.

c) should be the answer.

the pseudoscience are like beliefs, theories, or like practices that are considered scientific