What do the arrows on the graph below represent? a. extinction events
b. meteorite impacts
c. changes in earth temperature
d. the evolution of a new species

Why are common names a problem for scientist?

Ascientific idea becomes valid when it is what?

Asegment id dna that is artificially created from two or more organism through use of dna enzymes in a laboratory is called a segment of dna that is artificially created from two or more organisms through use of dna enzymes in a laboratory is called