Photosynthesis by Algae
Algae play a significant role in photosynthesis, contributing to nine-tenths of the world's photosynthetic activity. This is due to several factors that make algae crucial in the process of converting light energy into chemical energy.

Abundance and Diversity
Algae are found in various aquatic environments such as oceans, lakes, and rivers, as well as in moist terrestrial habitats. Their abundance and diversity allow them to contribute significantly to global photosynthesis.

Efficient Photosynthetic Machinery
Algae have efficient photosynthetic machinery that enables them to capture light energy and convert it into organic compounds. They contain chlorophyll and other pigments that absorb light at different wavelengths, maximizing their ability to photosynthesize.

Carbon Fixation
Algae play a crucial role in carbon fixation, removing carbon dioxide from the atmosphere and converting it into organic matter through photosynthesis. This process is essential for regulating the Earth's carbon cycle and maintaining a balance of gases in the atmosphere.

Role in Ecosystems
Algae form the base of many aquatic food chains, providing energy and nutrients to a wide range of organisms. They also release oxygen as a byproduct of photosynthesis, contributing to the oxygen levels in the atmosphere.

Conclusion
In conclusion, algae are key players in the global process of photosynthesis, accounting for nine-tenths of the world's photosynthetic activity. Their abundance, efficiency in capturing light energy, and role in carbon fixation make them essential for sustaining life on Earth.