test
node1
BFO:0000015
process
node2
GO:0008150
biological_process
node1->node2
node4
GO:0050896
response to stimulus
node2->node4
node3
BFO:0000003
occurrent
node3->node1
node3->node3
node6
GO:0009628
response to abiotic
stimulus
node4->node6
node5
BFO:0000001
entity
node5->node3
node7
GO:0009268
response to pH
node6->node7
node8
GO:0010446
response to alkaline
pH
node7->node8