GWD-04-38

Q38:

Two centuries ago, laceName>TufelaceName> laceType>PeninsulalaceType> became separated form the mainland, isolating on the newly formed laceName>TufelaceName> laceType>IslandlaceType> a population of Turfil sunflowers.  This population’s descendants grow to be, on average, 40 centimeters shorter than Turfil sunflowers found on the mainland.  laceName>TufelaceName> Island is significantly drier than Tufe Peninsula was.  So the current average height of Tufe’s Turfil sunflowers is undoubtedly at least partially attributable to changes in Tufe’s environmental conditions.

Which of the following is an assumption on which the argument depends?

Tufe Peninsula became separated form the mainland, isolating on the newly formed Tufe Island a population of Turfil sunflowers

I think that this sentence seems to be a little strange? whether 'form'should change to the word 'from

??

This population’s descendants grow to be, on average, 40 centimeters shorter than Turfil sunflowers found on the mainland.  laceName>TufelaceName> laceType>IslandlaceType> is significantly drier than laceName>TufelaceName> laceType>PeninsulalaceType> was.

however, from the sentences aboved, we can deduce that Tufe Peninsula and the mainland are the same place?