You are presented with the question "What kind of circulatory system do fish have?" and the following answer choices: - open - solid - closed - three - stagnant - kinetic - complex - gills Now knowing that chordates have a complete digestive system and a closed circulatory system and chordates Chordates Chordates include fish, amphibians, reptiles, birds, and mammals, choose the best answer.
closed

You are presented with the question "Cold fronts cause what?" and the following answer choices: - lightning - Dehydration - erosion - mountains - sunlight - rainfall - sunsets - flooding Now knowing that cold fronts cause thunderstorms as they pass by and all thunderstorms produce lightning, choose the best answer.
lightning

You are presented with the question "What do producers use with inorganic chemicals to make food?" and the following answer choices: - The sun - properties - bamboo - trees - vegetation - heat - plant life - Hemoglobin Now knowing that producers use energy and inorganic molecules to make food and sun light is the provider of energy, choose the best answer.
The sun