test
node1
BFO:0000003
occurrent
node1->node1
node2
BFO:0000015
process
node1->node2
node6
GO:0008150
biological_process
node2->node6
node3
GO:0050896
response to stimulus
node4
GO:0009628
response to abiotic
stimulus
node3->node4
node5
GO:0070482
response to oxygen
levels
node4->node5
node8
GO:0036296
response to increased
oxygen levels
node5->node8
node6->node3
node7
BFO:0000001
entity
node7->node1