I recently found out that commitment scores decay over time.
It would be nice to see how many people are still interested in the biology proposal—it's over a year old! So please un-commit and commit to update the score.
Actually, that doesn't help much for the Biology proposal.
If you go to the proposal page, there's a blue box on the right hand side that ends with a "▾ more info" link. If you click that, the box expands, and you see something like this:
I circled the commitment score, but the commitment percentage itself is the lowest of those three numbers.
Looking at the numbers, the proposal's limiting factor is the number of committers with 200+ rep elsewhere—that is, everyone who's currently committed could re-commit, and the commitment percentage wouldn't change at all.
For the proposal to progress, what's really needed is: