Leaf shapes vary widely among different plant species, and they can be classified into several categories. Common shapes include oval, lanceolate (long and narrow), cordate (heart-shaped), and palmate (like a hand with fingers). The shape of a leaf can influence how it captures sunlight and how it loses water through transpiration. The structure of a leaf is also important for its function. For example, needle-like leaves, found in many conifer trees, reduce water loss and are adapted to cold climates. In contrast, broad leaves, like those of maple trees, maximize sunlight absorption in warmer environments.