Kangaroo rat is capable of meeting all its water requirements through:
1. Storing water when available
2. Dry seeds and foliage
3. Metabolic water
4. Burrowing deep to get water

All the following are adaptations in desert plants to minimize water loss except:
1. Thick cuticle
2. ${\mathrm{C}}_3$ photosynthesis
3. CAM pathway
4. Sunken stomata

High altitude acclimatization in humans include all the following except: