Re-order Paragraphs

Put the sentences in the correct order:

1. ▲▼For this reason, researchers now argue that smell deserves far more credit than the dismissive label of a "primitive" sense suggests.
2. ▲▼When these receptors fire, they send signals directly to brain regions tied to memory and emotion, which explains why a single whiff can summon a vivid recollection.
3. ▲▼This remarkable sensitivity exists because scent molecules bind to hundreds of distinct types of receptors lining the nasal cavity.
4. ▲▼In reality, the human nose can distinguish among an estimated trillion different odours, a range that dwarfs our ability to discriminate colours or musical tones.
5. ▲▼Most people assume that the sense of smell is a minor faculty, far less important than sight or hearing.