Animals exhale this gas, plants use it in photosynthesis, and it gives soft drinks their fizz.

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Your new ahaCarbon Dioxide

Carbon Dioxide: Gas exhaled by animals and absorbed by plants. Source: Carbon dioxide ↗

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16This green plant pigment captures light energy for photosynthesis.RECALL
Chlorophyll
Chlorophyll gives plant leaves their green color and captures sunlight to power photosynthesis.
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17This sour cooking liquid is a dilute solution of acetic acid.RECALL
Vinegar
Vinegar is dilute acetic acid, useful both as a cooking ingredient and a household cleaner.
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18This common liquid expands as it freezes, helping its solid form float.RECALL
Water
Water is unusual among common substances for expanding rather than shrinking as it freezes.
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