The answer is B. Enzymes have optimum temperatures, and are very specific. If substrate concentration is 0, enzymes will not work.
Anaphase and Metaphase both have spindle fibers, yet they have different functions <span>(metaphase) is used to align the chromosomes along the equator of the cell and the other(anaphase) has the spindle fibers shorten to move the chromosomes. </span>
The answer is B because it is a biological component the affects the serotonin output in the brain
Answer: C) They can contain contaminants that can enter the air during storms or high winds.
Explanation: A is wrong because I got it wrong (Sorry, can't give much explanation there).
B is wrong because water contamination does not directly relate to respiratory health.
D is wrong because fertilizers can impact respiratory health (Explanation seems lack-luster, but I feel like this is common sense).