IELTS Reading: examples of true, false, not given

Here are some good examples of true, false, not given. Can you explain the three answers below?

(from test 4, passage 2 in Cambridge IELTS 14)

1. TRUE

Question: An animal is likely to live longer in a zoo than in the wild.
Passage: The average captive animal will have a greater life expectancy compared with its wild counterpart.

2. FALSE

Question: Zoos have always excelled at transmitting information about animals to the public.
Passage: ...communicate information to visitors about the animals... This was an area where zoos used to be lacking.

3. NOT GIVEN

Question: Improvements in the quality of TV wildlife documentaries have resulted in increased numbers of zoo visitors.
Passage: It is true that television documentaries are becoming ever more detailed and impressive.