Gases have no defined shape or volume.
Answer:
A. Has the herbicide caused damage to the corn?
It would be primary since the writer himself is getting the information from a direct source.
Answer:
oxygen , carbon , hydrogen , nitrogen , phosphorus , sulfur are some examples
p = m / V (Density = Mass / Volume)
p = m / (w * l * h) (Density = Mass / [Width * length * height]) (V = w * l * h)
p = 120 / (5 * 4 * 3) (Mass = 120g [Given] w=5 l=4 h=3 [Given])
p = 120 / 60
p = 2 g/cm^3
Answer is B (2)