ALOT
well it depends how much the alligator eats that year. if it eats a lot that's how much it will grow.
8 and 10
15 feet
No they can not. Where did you get that from?
They grow as much as 4.5 cm year. But colonies of coral grow as much as 10 cm a year
20 million grow in a year
American alligator can grow to 17 feet long and weight 990Ibs
1 feet long
20-30 years
No. The maximum size an alligator will typically grow to is around 14 feet, but the record length for an american alligator is 19 feet 2 inches and was caught in Louisiana in the early 1900's.
That depends on where you grow it and where, specify please.
Arborvitaes typically grow about 6 to 12 inches per year.