Category: Science > Biodiversity
While most people associate red blood with oxygen-rich hemoglobin in humans and many animals, the color of blood can vary significantly across different species due to the presence of various respiratory proteins. For instance, some mollusks and arthropods use hemocyanin, which contains copper and turns blue when oxygenated. This adaptation is particularly useful for organisms that thrive in low-oxygen environments, such as deep-sea creatures. Additionally, some species of worms have green blood due to the presence of chlorocruorin, which functions similarly to hemoglobin but is adapted to their unique habitats. These variations not only illustrate the incredible diversity of life on Earth but also highlight the evolutionary adaptations that allow different organisms to survive in their respective environments, showcasing the intricate relationship between biology and the challenges posed by nature.