input: OPTIONS:
- methane from livestock
- aerosol spray
- chimneys
- burning of fossil fuels Now, answer this question: Q: What is the main cause of outdoor air pollution? A:
A:
output: burning of fossil fuels

Q: Iron is oxidized to fe2+(aq) at an anodic site on the surface of the iron, which is often an impurity or this? A:

OPTIONS:
- displacement defect
- spontaneous mutation
- ladder complex
- lattice defect

Answer: lattice defect

Problem: OPTIONS:
- zinc
- gold
- silver
- bronze
Q: Q: What is an alloy of copper and tin? A:
Answer: bronze

Problem:OPTIONS:
- toxic
- persistent
- malignant
- benign

Q: What type of tumor mostly does not cause serious problems and can be completely removed by surgery? A:
****
A: benign

Q: Like other bryophytes, moss plants spend most of their life cycle as? A:
OPTIONS:
- spores
- copepods
- bacteriophages
- gametophytes
gametophytes

Q: What do a group of cells that work together form? A:
OPTIONS:
- molecule
- organelle
- organ
- tissue

Answer:
tissue