2). What do enzymes do in your body?

Enzymes are a type of protein used as catalysts for chemical reactions.

it has one origin of replication, but it proceeds in two directions - d)

the rocks are classified by the geological process they are formed by. the three main groups of rocks are igneous, metamorphic, and sedimentary. minerals are not they are classified under the chemical classes they are in. these groups include silicates, sulfates and carbonates.