1 multiple choice 10 points which of the following processes removes carbon dioxide from the atmosphere? save lc: burning fossil fuels respiration photosynthesis decomposition 2 multiple choice 10 points which statement does not describe an effect on the carbon cycle when humans clear - cut forests? save lc: plants that contain stored carbon are destroyed. less carbon falls to the ground as acid rain. soil releases carbon from decayed plant matter into the atmosphere. there are fewer plants to remove carbon dioxide from the atmosphere. 3 multiple choice 10 points precipitation and evaporation are important components of the save lc: water cycle carbon cycle nitrogen cycle phosphorus cycle 4 multiple choice 10 points all of the statements about the nitrogen cycle are true except one. that is save lc: (partially visible options)

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### Question 1
# Brief Explanations:
- Burning fossil fuels releases CO₂, so it's out.
- Respiration (by organisms) releases CO₂, not remove.
- Photosynthesis: Plants take in CO₂ to make glucose, removing it from the atmosphere.
- Decomposition releases CO₂ as organic matter breaks down.
# Answer: photosynthesis (the option with "photosynthesis")

### Question 2
# Brief Explanations:
- Clear - cutting destroys plants (stored carbon), so first option is an effect.
- Acid rain is related to sulfur and nitrogen oxides, not directly to forest clear - cutting's effect on carbon cycle. Clear - cutting doesn't reduce carbon in acid rain.
- When forests are cut, soil decomposition of plant matter releases more CO₂, so third option is an effect.
- Fewer plants mean less photosynthesis to remove CO₂, so fourth option is an effect.
# Answer: Less carbon falls to the ground as acid rain (the option with this statement)

### Question 3
# Brief Explanations:
- Water cycle: Precipitation (rain, snow) and evaporation (water turning to vapor) are key parts.
- Carbon cycle: Involves processes like photosynthesis, respiration, not mainly precipitation/evaporation.
- Nitrogen cycle: Involves nitrogen fixation, nitrification, etc., not precipitation/evaporation.
- Phosphorus cycle: Involves weathering, uptake by plants, etc., not precipitation/evaporation.
# Answer: water cycle (the option with "water cycle")

### Question 4 (partially visible, but based on nitrogen cycle knowledge)
(Assuming typical nitrogen cycle questions) For example, if options are about nitrogen cycle processes:
- Nitrogen fixation: Converting N₂ to usable forms, correct.
- Fertilizers add nitrogen, correct.
- Denitrification: Converting nitrates to N₂, correct. (If one option is incorrect, e.g., a misstatement about the cycle)
But since the option text is not fully visible, but based on the pattern, we analyze:
Nitrogen cycle:
- Lightning can fix nitrogen (convert N₂ to NO₃⁻ etc.), correct.
- Fertilizers add nitrogen to soil, increasing nitrogen in ecosystems, correct.
- Denitrifying bacteria convert nitrates to N₂, returning to atmosphere, correct.
If an option says something like "Nitrogen is not found in proteins" (which is wrong, as proteins have nitrogen), that would be the incorrect one. But with the given partial text, we assume the standard analysis.
(Note: Since the option text is not fully clear, but following the format, we provide the general approach. If the actual options were, for example, one misstating the role of bacteria or the presence of nitrogen in compounds, that would be the answer.)

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