If fish have a closed circulatory system, then what kind of circulatory system do fish have? Answer choices: - open - solid - closed - three - stagnant - kinetic - complex - gills
closed

If cold fronts cause lightning, then cold fronts cause what? Answer choices: - lightning - Dehydration - erosion - mountains - sunlight - rainfall - sunsets - flooding
lightning

If producers use the sun and inorganic molecules to make food, then what do producers use with inorganic chemicals to make food? Answer choices: - The sun - properties - bamboo - trees - vegetation - heat - plant life - Hemoglobin
The sun