Q: Q: What gas do the lungs give up as they take in oxygen? Choices: - carbon monoxide - methane - nitrogen - carbon dioxide A:
A: carbon dioxide

Q: Q: What do we call the region on the lung root formed by the entrance of the nerves at the hilum? Choices: - renal plexus - heart plexus - brain plexus - pulmonary plexus A:
A: pulmonary plexus

Q: Q: Naphthalens is a chemical which is commonly used in what? Choices: - shampoo - fertilizers - inhalers - mothballs A:
A: mothballs

Q: Q: The oldest fossil of land plants date back how many millions of years? Choices: - 520 million years - 350 million years - 430 million years - 470 million years A:
A: 470 million years