4: a species is a group of interbreeding natural populations that are reproductively isolated from other such groups. Process of Speciation. The process of speciation is a 2 stage process in which reproductive isolating mechanisms arise between groups of populations.
The temperature of a substance is a measure of the average kinetic energy of the particles. A change in phase may occur when the energy of the particles is changed. ... There are attractive forces between atoms molecules, and these become stronger as the particles move closer together
I think the answer is Phenylketonuria.
Ethologist :D ..............................