Example: plants breathe in CO2 and expel O2 whereas animals do the
reverse.

Almost, but not quite. Plants' intake of CO2 is not really the same as
"breathing," because it is part of the process of manufacturing food
(photosynthesis). When it comes to UTILIZING food (metabolism), both plants
and animals take in O2 and exhale CO2, in the process of respiration. The
takeaway: theoretically, plants could survive in a world without animals, but
not the reverse.

Jie-san Laushi

Huodau lau, xuedau lau, hai you sanfen xue bulai
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to email: eliminate redundancy