Answer:
well in the first sentence it is a simile because she is comparing the way her stomache flutters to a butterfly visiting a field
in the second sentence it is a metaphor
in sentence number three it is a simile because she is comparing her noisy sister to a buzzing fly
in sentence number four it a metaphor
in sentence number five it is a metaphor
in sentence number six it is a simile because it is comparing the sunshine to a warm blanket on a cold rainy night
Explanation:
Simile-a figure of speech involving the comparison of one thing with another thing of a different kind, used to make a description more emphatic or vivid (e.g., as brave as a lion, crazy like a fox ).