Ques:You are presented with the question "What does blood in the veins have a lot of?" and the following answer choices: - Carbon dioxide - Carbon monoxide - h2o - Energy. - Air - kinetic energy - Decibels - Chemical energy Now knowing that veins generally carry deoxygenated blood and deoxygenated blood is heavy with carbon dioxide, choose the best answer.

Ans:Carbon dioxide
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Ques:You are presented with the question "A greenhouse is used to protect flowers from what?" and the following answer choices: - sunlight - fertilizer - salinity - Dehydration - cold air - the cold - Winter - irrigation Now knowing that agreenhouse is used to protect plants from the cold and flowers are beautiful kinds of plants, choose the best answer.

Ans:the cold
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Ques:You are presented with the question "What helps cells survive?" and the following answer choices: - DNA - all copper - air - space - RNA - coat - heat - gasoline Now knowing that cells cannot survive without oxygen and air contains oxygen, choose the best answer.

Ans:air
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Ques:You are presented with the question "Space explorers require preserved foods for" and the following answer choices: - ground training - nutrients - Dehydration - survival - long flights - short flights - Special disposal - day trips Now knowing that astronauts require preserved food for extended flights and an astronaut is a scientist who is a space explorer, choose the best answer.

Ans:
long flights
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