*Question*
If inhaled pollutions harms the respiratory system, then what system does inhaled pollution harm? Answer choices: - health - humans - the environment - circulatory - people - bones - lymphatic - cell wall
**Answer**
circulatory

*Question*
If fungi are the only organisms that can decompose pine trees, then fungi are the only organisms that can decompose what? Answer choices: - litter - pine - bamboo - matter - coal - maples - plants - elms
**Answer**
pine

*Question*
If tidal caves can produce electricity, then what can produce electricity? Answer choices: - rivers - animal transport - tidal caves - Nematoda - rays or beams - animals - cactuses - photons
**Answer**
tidal caves

*Question*
If plant reproduction requires animals, then what does plant reproduction require? Answer choices: - energy - Energy. - bloom time - insects - snow - animals - rivers - clouds
**Answer**
animals