*Question*
Q: Puberty and other physical changes occurs during which stage of development? Choices: - childhood - infancy - adulthood - adolescence A:
**Answer**
adolescence

*Question*
Q: Many species secrete a hard external skeleton of what? Choices: - sodium bicarbonate - hydrogen carbonate - carbon dioxide - calcium carbonate A:
**Answer**
calcium carbonate

*Question*
Q: How do dogs lose body heat? Choices: - barking - sweating - eating - panting A:
**Answer**
panting

*Question*
Q: What is the protein that carries iron that binds with oxygen in red blood cells? Choices: - keratin - potassium - insulin - hemoglobin A:
**Answer**
hemoglobin