Simplify the following text for a Grade 6 native English-speaking person.
Original: Cadmium performs the same function as zinc in other anhydrases , but the diatoms live in environments with very low zinc concentrations and thus they utilize cadmium to perform functions normally carried out by zinc .
Simplified: Cadmium is taken from the zinc metal by heating the zinc metal in a vacuum . Cadmium is boiled first .