Book: Lung

Because these organs are essentially open to the air, they are prone to drying out. This is why many spiders require high humidity to breathe effectively. 💡 Key Evolution Fact

More efficient at delivering high amounts of oxygen to very active insects. book lung

Better for surviving in arid environments because they are more water-efficient. Because these organs are essentially open to the

These are the "pages"—thin, leaf-like membranes filled with hemolymph (the arachnid version of blood). book lung