Hey Buddy here is ur answer :
Precipitation reactions occur when cations and anions in aqueous solution combine to form an insoluble ionic solid called a precipitate. Whether or not such a reaction occurs can be determined by using the solubility rules for common ionic solids.
Hope it helps you ...
The answer is ribosomes. Ribosomes produce proteins for the cell.
<span>The mantle is more dense, so it can not B.
Not even A , because the crust sure does contain naturally occurring radioactive material. Heat is also not efficiently transferred to the surface--most ground is cool,
so correct option is none is above that is D
hope it helps</span>
Scientist study index fossils so they will get an understanding of what life was like back then.
Can you provide more details ?