Answer:I think it is oxygen
Explanation:
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None.
There's no such thing as "short term climate change".
By definition, climate change is a long term.
Short term changes are "weather", which has a great many causes.
Hope this helps :)
For the answer to the question above,
<span>The only taxon in which the biological characteristics are clearly identifiable is the <em><u>"species".</u></em></span>