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

when a reversible reaction is occurring in both directions at the same rate; the products and reactants do not change in concentration. a chemical reaction where the compound is broken into its constituent parts.

some fungi obtain their nutrients from a living host (plant or animal) and are called most biotrophic fungi have fairly narrow host ranges—they are specialized on a limited called rhizomorphs that allow the fungus to grow from one tree to another. ascospores are formed inside a sac-like structure called an ascus. so your answer is a