Answer:
usage of trills and vibrato
Explanation:
earlier music used trills while later styles would use vibrato.
Freezer and refrigerator--> Too cold for most bacteria to grow (reproduce). Oven --> too hot for bacteria to survive
A shared derived characteristics is usually a homologous structure, such as a backbone, that is shared by all organisms in a group.
Answer:
See below
Explanation:
Ammonium 
is not a molecular ion because it is just a poly-atomic ion. A molecular ion has a "negative or positive charge" as a whole but the positive charge on here is not on the whole. So, it is a poly-atomic ion and not molecular ion.
