If photosynthesis and cellular respiration form a cycle, why do plants need to continually take in carbon dioxide,
oxygen, and water from the environment?

The glucose(from cellular respiration) is turned back into carbon dioxide, which is used in photosynthesis. While water is broken down to form oxygen during photosynthesis, in cellular respiration oxygen is combined with hydrogen to form water.

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Explanation:

Plants release excess oxygen, carbon dioxide, and water back into the environment. They don’t store them indefinitely. So, they continually need to take in these elements.

Explanation

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the element that provides strength to the exoskeletons of clams and oysters is phosphorus. this is so because calcium carbonate is the main component in the shells.

explanation: