Q: What are modified leaves that bear sporangia? Choices: - spines - neutrophils - sporozoans - sporophylls A:
sporophylls

Q: Radiation can be absorbed or shielded by materials, particularly what material used to make protective aprons worn by x-ray administrators? Choices: - cotton - steel - carbon - lead A:
lead

Q: What is the sequence of elementary steps that together comprise an entire chemical reaction called? Choices: - reaction circle - mechanical mechanism - basic reaction - reaction mechanism A:
reaction mechanism

Q: What forms when nitrogen and oxygen combine at high temperatures? Choices: - oxygen oxide - ammonia oxide - carbon dioxide - nitrogen oxide A:
nitrogen oxide