👉 Algae biology, or phycology, is the study of algae, which are photosynthetic, often aquatic organisms that play crucial roles in ecosystems. Algae are diverse, ranging from microscopic single-celled species to large seaweeds, and they include green algae, red algae, brown algae, and diatoms, among others. They perform photosynthesis, converting sunlight into energy and producing oxygen, which is vital for most life on Earth. Algae serve as primary producers in aquatic food webs, forming the base of many ecosystems, including freshwater and marine environments. They also have significant ecological and economic importance; they help regulate water quality by absorbing nutrients, provide habitats for various organisms, and are used in biotechnology, pharmaceuticals, and as a sustainable source of biofuels and food.