Step 1: Definition of Spore Formation.
Spore formation is a method of reproduction in which an organism produces spores, which are capable of developing into new individuals without fertilization.
Step 2: Reproduction in Algae, Fungi, and Plants.
Algae and fungi commonly reproduce by producing spores.
Many land plants (like mosses and ferns) also reproduce through spores, especially in their non-flowering stages.
Step 3: Conclusion.
Therefore, algae, fungi, and many land plants commonly reproduce by spore formation.