Question: If ferns use stems to store water, then what uses stems to store water? Answer choices: - bacteria - humans - Oak - rocks - trees - ferns - fens - amoebae
Answer: ferns

Question: If erosion can cause seismic vibrations which are triggering mechanisms, then what can cause seismic vibrations, which are triggering mechanisms? Answer choices: - wind - erosion - vehicles - flooding - waves - rivers - energy - mines
Answer: erosion

Question: If be prepared for clear, cold days after thunderstorms, then be prepared for clear, cold days after what? Answer choices: - global warming - spring - droughts - heat waves - thunderstorms - Dehydration - Greenhouse gases - Animal survival
Answer:
thunderstorms