Teacher-curated, self-paced courses. Looking for a guided sequence through a full topic? See Learning Paths.
The two big kingdoms are the ones you know best. In this course we state what makes a plant a plant and an animal an animal. Then we go to the edge of life: the viruses, which can be crystallised like a salt, the viroids, the prions, and the lichens, in which an alga and a fungus live as one body.