Did either of the sisters bring her umbrella?
Either is singular.
Answer:
Its source is in the Guinea Highlands in southeastern Guinea. It runs in a crescent through Mali, Niger, on the border with Benin and then through Nigeria, discharging through a massive delta, known as the Niger Delta or the Oil Rivers, into the Gulf of Guinea in the Atlantic Ocean.
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You could read the passage and instead of copying exactly what it says, put it in your own words. Make it your own but be sure to you remain on the same subject
