Question

Which of these have lungs?
(A)Earthworms
(B)Starfish
(C)Cockroaches
(D)None of the above

Answer 1

Hint: The primary organs that come under the respiratory system are the lungs that are present in the humans and many other animals and some more vertebrates. Lungs are absent in insects and invertebrates whether they are marine invertebrates or terrestrial invertebrates.

Complete step by step answer:
None of the above organisms possess lungs. Starfish don't use gills or lungs to breathe. They depend on the diffusion across surfaces in their body. Cockroaches have special features i.e they can hold their breath for up to seven minutes. Their respiratory system is very efficient but there are not any lungs. The insects draw in the air with the help of the external valves called spiracles and transport the air on to the cells via tubes called trachea. Earthworms don't have lungs. They breathe through their skin. Oxygen and ${ CO }_{ 2 }$ pass through the earthworm's skin by diffusion.

So, the answer is option D.

Additional information: The primary feature of the lungs is the gas exchange mechanism called respiration (or breathing). Oxygen from the incoming air reaches the blood during respiration, and carbon dioxide, waste gas from oxidation, exits the blood. The lungs are in our chest, and they're so big they take up most of the room in your chest. We humans got two lungs, but they're not the same size as your nostrils or eyes. It was seen that the lung on your body's left side is a bit smaller than the lung on your right side. On the left side, this extra space leaves room for your heart. The left lung with 2 lobes is slightly smaller, while the right lung with 3 lobes is greater.

Note:
The rib cage of humans is composed of 12 sets of ribs, protecting your lungs. These ribs are known to be attached to your spine in your back and go around your lungs to keep them healthy.