Lichens are made of two different, cooperating organisms: an alga and a fungus. Lichens live on rocks, tree
branches, and even houses. You can also find lichens living on metal. Some can be so small that you must use a
microscope to see them. But some are large, leafy, and crusty growths. Lichens come in many different colors
and are found all over the world. There are lichens in Antarctica and Africa. Some even survive trips into outer
space. Scientists think that lichens may also grow on Mars.
Lichens live in many___
A.aquariums
B.businesses
C.climates
D.orchards