The speciation and extinction of the dinosaurs are examples of , and the increased frequency of a particular genotype that specifies a color pattern in fish is an example of .

If scientists are wrong about earth's age based on radioactive material and the decay rates are really much faster, how would nuclear power plants be affected?

The tubes transporting minerals and water upward are called ?

What are the two causes of density in deep current waters? a. salinity (how much salt) of the water and high temperaturesb. salinity (how much salt) of the water and low temperatures c. oxygen content of the water and high temperatures. d. oxygen content of the water and low temperatures