Answer the following question given this paragraph: The combined magnetic force of the magnetized wire coil and iron bar makes an electromagnet very strong. Q: The combined magnetic force of the magnetized wire coil and iron bar makes an electromagnet what? A:
OPTIONS:
- very reduced
- Very light
- very heavy
- very strong

Answer: very strong

Answer the following question given this paragraph: A chemical reaction is a process in which some substances, called reactants, change into different substances, called products. During the reaction, chemical bonds break in the reactants and new chemical bonds form in the products. Q: What type of reaction is a process in which some substances, called reactants, change into different substances, called products? A:
OPTIONS:
- reversible reaction
- physical reaction
- toxic reaction
- chemical reaction

Answer: chemical reaction

Answer the following question given this paragraph: Q: What phenomenon sometimes causes harmful alleles to become fixed? A:
OPTIONS:
- natural selection
- competition
- spontaneous mutation
- genetic drift

Answer:
genetic drift