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because they just do

Plants with small leaves live in extreme environments. Some plants have big leaves to make photosynthesis easier for the plant probably because it lives somewhere shady. Plants with small leaves have lots of light so big leaves are not required. The bigger the leaf the bigger the surface area so big and small leaves collect the same amount of light.

**Edit**

Additionally a big factor that stresses effective leaf sizing is the amount of atmospheric moisture and heat. Some plants will fix carbon in the night time, reducing the amount of water loss they experience through the stomata, but others do not: as they intake CO2, they also lose water due to the heat. Hence a cactus's leaves are thin needles. Doesn't allow for a lot of CO2 fixation (so slow growth), but there's very little evaporation, so they don't die easily. It's a tradeoff for many plants.

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Q: Why do some plants have small leaves and some have big leaves thank you?
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