Misc: In Rome, what was the Cloaca Maxima?

Questions

earthworms have ---------- hearts?

every single hamster in the u.s. today comes from a single litter captured in ---------- in 1930?

every single hamster in the u.s. today comes from a single litter captured in syria in----------?

fur ---------- get miserably sick when they're carried aboard ships?

giant flying foxes that live in ---------- have wingspans of nearly six feet?