How are the spines on a cactus different from the leaves on an oak tree? 1. They provide nutrient intake
2. They provide heat exchange
3. They reduce water loss
4. They reduce oxygen release

3.
Explanation: Cactus spines are basically modified leaves. They defend the cactus against herbivores but also assist in reducing water loss by reducing air flow to the cactus, which provides shade. And due to no leaves the cactus stems are what carry out photosynthesis. In simpler terms, the water on leaves can be lost due to evaporation, but cactus spines don’t.

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