What are gross primary production and net primary production and how do they dilter? Why is this an important measure?

In iceland, the mid atlantic ridge runs through the center of the contry. what can you conclude about the apperence of iceland many thousands of years from now?

Plants consume most of their carbon from a. the soil b. the water c. the roots d. the air

Is becoming less expensive to screen blood samples for dna certain diseases have genetic basis what is possible ethical concern about the availability of inexpensive dna testing