Q: If using some engines requires burning fossil fuels, then what requires burning fossil fuels? Answer choices: - Fuel cells - using electricity - animals - Cooking - organisms - engines - lightning - solar power
A: engines

Q: If rock overhangs are used by animals to protect against weather, then what do animals find protection from when using rock overhangs? Answer choices: - sun's heat - insects - weather - erosion - rivers - bats - wind - the sun
A: weather

Q: If damage to the structural units of the kidneys can be caused by high blood pressure , then damage to the structural units of the kidneys can be caused by ..? Answer choices: - harmful substances - an area swollen with pus - a lot of human deaths - Pesticides - Heavy rains - Leptospirosis - Veins and arteries. - high blood pressure
A: high blood pressure

Q: If all biological membranes have lipids as the main consituent which consist of fatty acids, then what is the major thing that biological membranes consist of? Answer choices: - chemicals - glucose - lipids - Energy - complex - oxygen - matter - an ion
A: lipids