This is the 4433rd most frequent German word.
infrage
"Infrage" means "in question" or "under consideration."
The word 'infrage' is part of the phrase 'infrage stellen', which means 'to question' or 'to call into question'. Here it's used to indicate doubt or reconsideration about the existence of the species.
Die Existenz der Spezies wird infrage gestellt.
The existence of the species is being questioned.
'Infrage stellen' is used here again to denote questioning or challenging something, in this case, the principles.
Es ist nicht notwendig, die Prinzipien infrage zu stellen.
It is not necessary to question the principles.
Here, 'steht infrage' indicates that the project is uncertain or doubtful due to a lack of secured funding.