test
node1
GO:0009628
response to abiotic
stimulus
node2
GO:0070482
response to oxygen
levels
node1->node2
node6
GO:0036293
response to decreased
oxygen levels
node2->node6
node3
GO:0008150
biological_process
node4
GO:0050896
response to stimulus
node3->node4
node4->node1
node5
BFO:0000003
occurrent
node5->node5
node7
BFO:0000015
process
node5->node7
node7->node3
node8
BFO:0000001
entity
node8->node5