How are compounds in different types of organisms can be used to benefit people

There are many of compounds which can be obtained from living things. These compounds are mostly used as a drugs. Many researcher are doing work to identify compounds present in living organism which may be helpful to peoples. They screen out many thousand compounds out of which only few compounds have desirable characteristics.

Example:

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

            and  

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.  

i think   the answer is c hope i'm right