Answer:
B.
Explanation:
plants produce oxygen in photosynthesis
Answer:
Over time people move to other places depending on their opportunities.
Explanation: If someone wanted to be a farmer they would settle down in a more fertile area where they can get more land. and someone who wants to be a lawyer or doctor would settle in a more busy area in the city.
Answer:
option a because the industrial revolution created more inventions making factories work faster and more efficiently.