Shelf Life vs Life Span

One night.

Mangosteen: I am going to change bedding for hammie.

Lemon: Ok..How long is it shelf life?

Mangosteen: What shelf life? It is not a product ok. =.=

Lemon: Err..What to call then.

Mangosteen: *tsk* Life span.

Lemon: Owh...

Mangosteen: 1.5- 2 years.

Lemon: You study a lot of Biology sure you use to the word 'life span'. I study food sure I use to the word 'shelf life'. *Hng*

Still can give a reason.

Keke...