The approximate life span of a parrot is 20 years. This means that on average, a parrot will live for around 20 years.
Option 1: 20 years - This is the correct answer that indicates the approximate life span of a parrot.
Option 2: 40 years - This option suggests a longer life span for a parrot than is generally observed. Parrots are known to have a shorter life span than 40 years.
Option 3: 70 years - This option also suggests a longer life span than is typically seen in parrots. Parrots are not known to live for 70 years.
Option 4: 140 years - This option is highly exaggerated. Parrots do not live for such an extended period of time.
Overall, the correct answer is option 1, as it aligns with the average life span of a parrot.