What word needs an apostrophe ounce for ounce, humans aren't as strong as most insects or none

That's

thats the only inhabited island on the river

doesn't

no insect exist that doesn't have three pairs of legs

it's

the sun warms the part of earth that its shining on

hasn't

the cactus hasn't bloomed in five years

i'm

I'm sure hell be right back with his tools