Context: Eventually the host tree dies and rots and then all that 's left is the vine that 's now strong enough to be by itself as a strange hollow tree - thing . There was one we saw that was completely hollow and we could climb inside . When you look up you can see an opening at the top , so the whole plant is like a big straw or pipe Emma on the Bridge That walk was called the Tree Top Walk because it went to a big bridge going through the canopy .

Question: Why does only the vine get left behind after the host tree dies ?
Options:
0. Only the vine gets left behind after the host tree dies because people carved out the remains of the tree as it rots .
1. Only the vine gets left behind after the host tree dies because the vine parasitically fed on tree unti it was hollow .
2. Only the vine gets left behind after the host tree dies because the tree had rotted away wile the vine still lives .
3. None of the above choices .
Answer: 2