Ques:If cars harm the respiratory and circulatory systems, then what harms the respiratory and circulatory systems? Answer choices: - oil - rain - sulfur - cars - tires - coal - tar - bicycles

Ans:cars
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Ques:If living things all require energy for reproduction, then what do all living things require in order to reproduce? Answer choices: - Proteins - food - DNA - nutrients - energy - Light - bamboo - sunlight

Ans:energy
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Ques:If pregnancy begins when a sperm and an egg fuse, then what begins when a sperm and an egg fuse? Answer choices: - Leptospirosis - cellular regeneration - h2o - seeds - death - pollen - pregnancy - competition

Ans:pregnancy
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Ques:If aneurysms are caused by relaxation of cell walls of blood vessels, then what relaxes, thereby causing aneurysms? Answer choices: - layers of fat - Veins and arteries. - sweating - matter vibrating - blood vessels - the skin - Chemical energy - sensory neurons

Ans:
blood vessels
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