I do not agree with the Question 3: in the passage, it is clearly stated that"feathers were replaced by scales because the feathers were not needed for". This clearly implies that: 1. There were feathers 2. They were no longer useful 3. They evolved to scales in other words: Scales evolved from feathers.
However, in the answer choice, it states that it is feathers that "might have evolved from the scales". X->Y is not same as X<-Y
Although I don't like this answer choice,
...
However, in the answer choice, it states that it is feathers that "might have evolved from the scales". X->Y is not same as X<-Y
Although I don't like this answer choice,
...
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