Which constraint affects xylem transport at high altitudes?

💡 Explanation

Reduced atmospheric pressure lowers the boiling point of water, thereby increasing cavitation risk via vapor-lock in xylem. Because tension is interrupted, water transport is diminished; therefore optimal water transfer is limited, rather than enabled by other options.

• Which risk increases for saltwater fish consuming excessive amounts of freshwater due to osmotic pressure imbalances?
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• Which outcome occurs when terrestrial insects close their spiracles?