Neco Model Questions Vol1 2023 Biology Question 45

A desert rodent employs three physiological adaptations to minimise water loss: 1. Highly concentrated urine that reduces water loss by **50 %** of the baseline. 2. Nasal counter‑current heat exchange that reduces water loss by **30 %** of the remaining water loss after adaptation 1. 3. Strict nocturnal activity that reduces the water loss remaining after adaptations 1 and 2 by **40 %**. A comparable non‑desert rodent loses **100 ml** of water per day. Assuming the reductions act sequentially as described, calculate: (a) The total daily water loss of the desert rodent after all three adaptations. (b) Which single adaptation contributes the greatest absolute reduction in water loss (in millilitres)?