16. Which of these statements about particulate matter less than 2.5 microns in diameter is true? A. They're less of a threat than particulate matter that's 10 microns in diameter.
B. They're the size of a human hair.
C. They can cause heart and lung disease.
D. They're produced from nitrogen gas (N2).

protocol for imps extraction focusing on membrane protein extraction, solubilisation, and purification.

1. loamy sand is about 80% sand with 10% clay and defined mostly by sand particles with some clay to provide structure and fertility. the sand particles are easily visible and the soil holds structure but breaks apart easily.

2. scott sand can improve his soil quality by incorporating more silt and organic matter into the soil. peat moss and organic matter can also be incorporated.

the correct answer is 2 and 4

its probably to later but whats the question