According to researcher carol dweck, when children believe that their intelligence is changeable and evolving, they experience a(n) mindset. she notes that this mindset is healthier than other beliefs about one's own intelligence.

growth        

Explanation:

Growth mindset: Carol Dweck, was a psychologist and she has given the mindset theory in which she talked about growth mindset. She proposed the mindset theory to understand the effects of an individual's belief or view on the nature of intelligence as it implies education and learning.

In the question above, when children believe that their intelligence is changeable and evolving, they experience a growth mindset.

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d. the polar jet stream   lies between the polar easterlies and trade winds should be your answer