Tell how the animals and plants of the ocean affect the chemical compositions of seawater?

The animals and plants of the ocean play a crucial role in influencing the chemical composition of seawater through various processes. Phytoplankton, for example, perform photosynthesis, absorbing carbon dioxide and releasing oxygen, which affects the pH and gas composition of seawater. Additionally, marine organisms contribute to nutrient cycling; for instance, the decomposition of organic matter releases nutrients like nitrogen and phosphorus back into the water. Overall, these biological activities help regulate the ocean’s chemistry, maintaining a balance that supports marine ecosystems.