Question: You are presented with the question "Which type of pollution is most harmful to lungs?" and the following answer choices: - Lead - air - Cars - oil - acid - CFCs - SO2 - mold Now knowing that air pollution harms the respiratory and circulatory systems and exposure to ozone can diminish lung function and increase susceptibility to respiratory infection, choose the best answer.
Answer: air

Question: You are presented with the question "Mutation in a gene pool is the raw material for what" and the following answer choices: - Most plants - animals - large litters - competition - Plants growth - many offspring - evolution - twins Now knowing that mutation creates new genetic variation in a gene pool and genetic variation is the raw material for evolution, choose the best answer.
Answer: evolution

Question: You are presented with the question "What about an object can cause objects to be pulled towards planets?" and the following answer choices: - phase - structure - Energy. - means - wind - energy - weight - sunlight Now knowing that gravity pulls objects towards planets and an object's weight is the force of gravity on that object, choose the best answer.
Answer:
weight