Question

why are tropical EVERGREEN forest known as lungs of earth

Answer 1

As they provide oxygen all year round they are called that. They provide us with large amounts of oxygen as our lungs provide our bodies

Answer 2

$\huge{ Answer }{\heartsuit}$

Tropical rainforests are often called the “lungs of the planet” because they generally draw in carbon dioxide and breathe out oxygen. But the amount of carbon dioxide they absorb, or produce, varies hugely with year-to-year variations in the climate.