The answer is insects.
Insects do not have blood in the traditional sense. Instead, they have a fluid called hemolymph that circulates throughout their bodies. Hemolymph does not carry oxygen like blood does. Instead, insects breathe through a system of tiny tubes called tracheae. These tubes branch throughout the insect's body, delivering oxygen directly to the cells.
Here's how it works:
- Air enters the insect's body through small openings called spiracles.
- These spiracles lead to the tracheae, which transport oxygen throughout the body.
- The oxygen diffuses directly into the cells, bypassing the need for blood to transport it.
This unique respiratory system allows insects to survive in a variety of environments, including places where oxygen levels are low.
