Definition: In this task, you will use your knowledge about language (and common sense) to determine what element the marked number refers to. The numbers are marked with two underlines around them, like: _ number _. Your answer should be chosen from the given text, and should not contain other words.
Input: Vin-Tak:  Sorry . The argument was going nowhere .
Phil Coulson: You back with us ?
Lady Sif: Yes . My memories have returned . I am Lady Sif of Asgard , friend of the S.H.I.E.L.D.
Vin-Tak: Asgardian
Vin-Tak: - well , that explains a lot .
Lady Sif: It is true . We do n't trust Kree . That is why I am here . When Heimdall saw that _ one _ landed on your world , Odin charged me of retrieving him .
Vin-Tak: So you came to pick a fight .
Lady Sif: We know enough about Kree history to be concerned .
Vin-Tak: Well , then , if you know Kree history , perhaps you 've heard the tale of Terrigenesis .
Lady Sif: Of course . Ancient Kree descending on planets , altering the inhabitants to fight their war .
Vin-Tak: And Earth was one of them .

Kree