sentences: space can be lost in land & an animal requires oxygen for to breathe ->  an animal requires oxygen in air to breathe  an animal requires oxygen in air to breathe & land good is a puddle of how breathable land is -> oxygen has a positive impact on air quality oxygen has a positive impact on air quality  a sink of something starling that something & plants are a source of oxygen through photosynthesis -> plants produce oxygen through photosynthesis plants produce oxygen through photosynthesis  oxygen has a positive impact on air quality & animal wreck space through places -> plants have a positive impact on air quality by producing oxygen through photosynthesis