Which organ is crucial for expelling cellular carbon dioxide waste?
a. liver
b. intestine
c. lung
d. kidney

The lungs are the organs that are most crucial in expelling cellular carbon dioxide waste. Lungs are the most important organ of the respiratory system. They excrete these wastes through the process of diffusion and exhalation. Without the proper excretion of carbon dioxide by the lungs, the blood will be left without oxygen and might be toxic to course through the bloodstream. The lungs are responsible for converting unoxygenated blood into oxygenated blood. Through this process carbon dioxide is expelled as the by-product.

1. true.2. true.3. true.4. false.5. true.the concept of darwin's theory of evolution involves the idea that there are limited resources in a given living environment and that the organisms which live within have variations in their genetic make up due to random mating. the ones with beneficial genetic variations can express certain traits which give them an upper hand in surviving and reproducing in the said environment compared to ones who may have a more disadvantageous variation in traits. over time, the organisms with an upper hand will survive and reproduce more frequently and pass on their beneficial genes while the others die. the result is evolution, where we observe (usually, but not always) eventually, phenotypic distinct changes.