Visit a jungle and I will disappear.
One, two meanings I have,
My second one can describe me.
Though I only have a few letters I mean a lot
Add some math and I may become two.
I have one and so may you,
A lot of care I require otherwise,
Beasts may lurk.
So, tell me this What am I?
This puzzle has heavy wordplay.
Take some lines literally!
Inspired by this puzzle.