test
node1
RO:0002310
exposure event or
process
node2
PECO:0001020
carbon dioxide
exposure
node1->node2
node3
PECO:0007189
chemical exposure
node4
PECO:0001004
inorganic chemical
exposure
node3->node4
node5
PECO:0001055
inorganic gas
exposure
node4->node5
node5->node2
node6
PECO:0007359
plant experimental
condition
node7
PECO:0001001
plant exposure
node6->node7
node8
PECO:0007191
abiotic plant
exposure
node7->node8
node8->node3
node9
BFO:0000003
occurrent
node9->node9
node10
BFO:0000015
process
node9->node10
node10->node1
node11
BFO:0000001
entity
node11->node9