If carbon dioxide is controlled between organisms and the atmosphere, then what is controlled between organisms and the atmosphere? Answer choices: - carbon dioxide - sweating - temperature - air pressure - heat energy - Pollution - energy usage - Chemical energy
carbon dioxide

If nutrients is passed up a food chain or web from lower to higher trophic levels, then _are passed from lower to higher trophic levels? Answer choices: - fossil fuels - rays or beams - nutrients - environment - animals - heat produced - Most plants - Light
nutrients

If cold is used to keep food fresh, then what keeps food fresh? Answer choices: - bacteria - sodium - lipids - cold - gas - sugar - cooled - dust
cold