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[–] Nurdoidz ago  (edited ago)

'It's' is a contraction. 'Its' is a possessive pronoun. The blog article used it like:

it means that an organism's mortality rate will not increase with it is age.


Be careful not to get the two mixed up. Some example sentences may include: My oak tree loses its leaves in autumn. My neighbor's cat never stays in its own yard. That bottle of wine is cheap, but it has its pluses.

The ''s' is appended to nouns to show possession. This rule does not apply to 'it', since the word also has a contraction 'it is', contracted as 'it's'. Instead, the apostrophe is dropped to 'its' to show possession. I do not get these confused.