How does phytoplankton help the environment?

Phytoplankton play a crucial role in the environment by producing oxygen through photosynthesis, contributing to about half of the Earth's oxygen supply. They also serve as the foundation of aquatic food webs, supporting a diverse range of marine life. Additionally, phytoplankton help regulate carbon dioxide levels in the atmosphere by absorbing CO2 during photosynthesis, which aids in mitigating climate change. Their presence is vital for maintaining healthy oceanic ecosystems and overall planetary health.