Mycorrhizal Fungi and Plant Roots: A Symbiotic Relationship

Mycorrizal fungi help plant roots absorb nutrients and fight off harmful, soil-dwelling predators. In exchange, the fungus receives sugars and nutrients from its host plant.

Yellow Lichen on Rock
Lichens from Antarctica survived 34 days in a laboratory setting designed to simulate the environment on Mars.
Photo by Fotolia/Ifrabanedo