How the function of life known as nutrition differs in Paramecium compared with the green alga Chlorella.?

In Paramecium, nutrition occurs through a process called phagocytosis, where the organism engulfs food particles, such as bacteria, into a food vacuole for digestion. In contrast, Chlorella, a green alga, utilizes photosynthesis to produce its own food by converting sunlight, carbon dioxide, and water into glucose and oxygen. While Paramecium is heterotrophic and relies on consuming organic matter, Chlorella is autotrophic, synthesizing nutrients from inorganic substances. This fundamental difference highlights the distinct nutritional strategies adapted to their respective environments.