Assertion: hornwort's structure | /r/CapableOf | control admission of air
Facets:
value: into a plant
type: TRANSITIVE-OBJECT
Source sentences:
text: A always lack two key features of the stem present in most of the remaining "caulocacti": like most non-cacti, their stems begin to form bark early in the plants' life and also lack stomata—structures that control admission of air into a plant and hence control photosynthesis.