Describe the overall trend in corn yield from 1988 to 2008. How does the trend in corn yield during that time compare to trends for total nutrients and nitrogen?

Plants that have reproductive structures called cones are?

1) what three conditions must be present for minerals to form through natural processes? 2) why are minerals considered inorganic substances? 3) how do oxides differ from other minerals that contain oxygen atoms? 4) how is a sulfide different from a sulfate? what makes native elements unique?

About how much of the cell mass is watet