Kingdom Protista

• Most diverse living organisms found in aquatic biomes.
• First Eukaryotes
• Sexual reproduction and multicellularity
• Algae: Photosynthesis, key oxygen producers, foundation of aquatic food webs
• Protozoa: Heterotrophic protsists, part of the nutrient cycling and part of the food chain
• Algae and protozoa live in many environments from freshwater to oceans
• Algae are beneficial for oxygen production an d as a food source
• Diseases like malaria are protists that kill humans
• Early life from signifying multicellularity and sexual reproduction