The chemical formula for emerald is be3al2(sio3)6. an emerald can be described as

An emerald can be described as a pure substance because it is a compound. Compounds are considered pure substances because they cannot be broken apart by any mechanical or physical process. A compound is any molecule that is made from two or more atoms of the same or different elements. Water is also considered a pure substance. it is made up of one oxygen atom and two hydrogen atoms. A water molecule cannot be separated by any mechanical or physical process. 

Your answer is  d.)relationship between pressure and air volume and led to the understanding of how respiration works

Bmust be the answer, as technically all organs move, so a is incorrect. all organs are made of different types of cells, so that isn’t a problem, so c is also incorrect. human hearts are very similar to many other animals’ hearts, so d is also incorrect, yet the heart is made of muscle, which is hard to grow in the lab so it would be correct to say b