Either these lights you saw in the night sky were alien spacecraft (ufos), or you were hallucinating. you obviously werent hallucinating. therefore, they had to be ufos. this passage contains the following relevance fallacy:

The quiver tree grows in southern africa. which of the following plant adaptations is likely to prevent these trees from dying out due to rising desert temperatures? releasing a black powder onto their trunk to absorb more heat from sunlight shifting their growing range towards the equator ability to store water in leafy structures to prevent excess evaporation limiting seed dispersal to nearby locations