If "not alive" => "doesn't need resources", then "needs resources" => "alive". That doesn't seem right to me.
A | B | A => B | ¬B => ¬A
T | T | T | T
T | F | F | F
F | T | T | T
F | F | T | T
This is false because there exist things that are non-living but move.
Similarly, the original "not alive" => "doesn't need resources" argument is false because there exist things that are not alive that do need resources (such as buses), and so needing resources does not imply being alive.
ianterrelwt posted the article explaining this.