Which describes one reason the composition of seawater is important?

One reason the composition of seawater is important is because it provides essential nutrients and minerals for various marine organisms. These nutrients, such as nitrogen, phosphorus, and iron, are necessary for the growth and survival of plants and algae, which form the base of the marine food web. Additionally, the presence of minerals like calcium, magnesium, and potassium in seawater is vital for the skeletal formation and overall health of marine organisms such as corals, mollusks, and crustaceans. Therefore, the composition of seawater plays a crucial role in supporting the biodiversity and ecological balance of marine ecosystems.