Light, air, water, nutrients and space – these are the conditions most plants need to flourish. For their part, plants are also essential food for humans and animals.
The process by which plants convert the sun’s energy into nutrients, is called photosynthesis. It takes place in the greenest parts of the plant. Oxygen is a by-product of photosynthesis. Without oxygen, animals and humans couldn’t breathe and exist.
All life on Earth is concentrated in the biosphere. This a relatively thin layer around the planet’s surface which supports all living things. The biosphere is made up of the lithosphere (soil and rocks), hydrosphere (water) and atmosphere (gases).