Question

1. photosynthesis and cellular respiration are complementary processes. fill in the blanks below. 12. a volcano erupts. decide whether each event adds or removes carbon from the atmosphere. 13. carbon dioxide dissolves in rainwater. 14. humans use gasoline to power their cars. 15. algae makes energy - rich carbon compounds through photosynthesis. 16. organisms carry out cellular respiration to release energy from food molecules.

Explanation:

1. Photosynthesis removes carbon - dioxide from the air, while cellular respiration returns it.
2. A volcano erupts. adds
3. Carbon dioxide dissolves in rainwater. removes
4. Humans use gasoline to power their cars. adds
5. Algae makes energy - rich carbon compounds through photosynthesis. removes
6. Organisms carry out cellular respiration to release energy from food molecules. adds

Step1: Understand photosynthesis and respiration

Photosynthesis uses carbon - dioxide from the air to make energy - rich compounds, so it removes carbon - dioxide. Cellular respiration breaks down energy - rich compounds and releases carbon - dioxide, so it adds carbon - dioxide to the air.

Step2: Analyze volcanic eruption

Volcanic eruptions release carbon - containing gases including carbon - dioxide into the atmosphere, so it adds carbon - dioxide.

Step3: Consider carbon - dioxide in rainwater

Carbon - dioxide dissolving in rainwater is a process that takes carbon - dioxide out of the atmosphere, so it removes carbon - dioxide.

Step4: Evaluate gasoline use

Burning gasoline (a carbon - rich fuel) by humans in cars releases carbon - dioxide, so it adds carbon - dioxide.

Step5: Think about algae photosynthesis

Algae use carbon - dioxide in photosynthesis to make energy - rich compounds, so it removes carbon - dioxide.

Step6: Examine cellular respiration in organisms

Organisms break down food (carbon - rich) in cellular respiration and release carbon - dioxide, so it adds carbon - dioxide.

Answer:

1. removes; returns
2. adds
3. removes
4. adds
5. removes
6. adds