More than

”The notion that pets need more than a minimum of care has been slow to catch on, perhaps because until recently the only animals that come into close contact with humans were those on farms.”

1. How is ‘more’ and ‘than’ functioning here? Which word is ‘more’ modifying?

2. I am I correct in saying that  ’perhaps’ as an adverb is modifying verb phrase ‘catch on’. 

3. Can we use ‘are’ in place of ‘were’. Please explain.

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