(4) Zirconium
This element is often used in the chemical production field, and as implants due to its high chemical resistance and stability.
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I believe it is A because the plant is offering protection while the bacteria is converting it in to nitrogen that the plant can use!
The salt causes the water to freeze at a lower temperature. When a solute, aka salt, is introduced to the system, the freezing point is lowered. This makes the water freeze at a lower temperature.
If the diatomic molecule consists of atoms from two different elements, then it is aheteronuclear diatomic molecule. There are seven elements that naturally occur as homonucleardiatomic molecules in their gaseous states: hydrogen,nitrogen, oxygen, fluorine,chlorine, bromine, and iodine
