Name two index fossils. Why are these fossils important to the practice of relative aging? PLS ANSWER ASAP!

Why is the structure of molecule important to its function?

The number to the right of an element's symbol (ex. c-12) identifies the of an isotope.

Assuming complete dissociation of the solute, how many grams of kno3 must be added to 275 ml of water to produce a solution that freezes at -14.5 c? the freezing point for pure water is 0.0 c and k_f is equal to 1.86 c/m