Identify which of the fossils would be INDEX fossils in this example of a cross section of rock a. bone and shell
b. bone and teeth
c. shell and leaf
d. leaf and teeth

An atom of which element reacts with an atom of hydrogen to form a bond with the greatest degree of polarity ?

At element makes up all organic compounds?

In the experiment you asked to react hydrochloric acid and with sodium hydroxide. when measuring the volume of the reactants, which instrument would give the greatest precision.