Why are plant leaves green?
Typically, plant leaves are green as they contain chlorophyll, which is a natural compound that helps the plant to absorb energy from light. 

However, leaves are not always green - some plants naturally have pink or orange leaves, and most plants also change leaf colors according to the seasons.
Por que as folhas das plantas são verdes?
Normalmente, as folhas das plantas são verdes, pois contêm clorofila, um composto natural que ajuda a planta a absorver energia da luz.