Can you determine the temperature at which two unknown substances change states?

"Mixed melting point determination" is a term used in chemistry.

Organic substances have a fixed temperature at which they liquify.

If a chemist wants to determine the nature of an unknown substance,

he can determine it by these means. If the unknown substance does

not melt at the usual temperature, it can be said to be impure. If

the chemist has two unknown substances and wants to determine what

they are, he may mix equal parts of each and start the

liquification process. If the combination melts at the usual

temperature, the chemist can say that both are the same. If the

chemist wants to determine the nature of an unknown substance, he

may mix a fixed amount of a known substance with a fixed amount of

an unknown substance, it can be estimated, what the unknown

substance is.

Boiling point is the temperature at which a substance changes from liquid → gas. Scientists determine melting or boiling point by heating a small sample of the substance, keeping careful track of the temperature the entire time. When they see a solid melt, they record the temperature as the melting point.

the correct answer is phenotype

it has one origin of replication, but it proceeds in two directions - d)