What is used to separate words or phrases in a series?

Write your own version on it. you can take away the fairy tale ending and replace it with a more realistic one. kinda confused on this one can you all me with this ik it only 20 points but its all i got. the three little kittens three little kittens they lost their mittens, and they began to cry, oh, mother dear, we sadly fear our mittens we have lost. what! lost your mittens, you naughty kittens! then you shall have no pie. mee-ow, mee-ow, mee-ow. no, you shall have no pie. the three little kittens they found their mittens, and they began to cry, oh, mother dear, see here, see here, our mittens we have found! put on your mittens, you silly kittens, and you shall have some pie. purr-r, purr-r, purr-r, oh, let us have some pie. the three little kittens put on their mittens, and soon ate up the pie; oh, mother dear, we much fear our mittens we have soiled. what! soiled your mittens, you naughty kittens! then they began to sigh, mee-ow, mee-ow, mee-ow. then they began to sigh. the three little kittens they washed their mittens, and hung them out to dry; oh! mother dear, do you not hear, the mittens we have washed! what! washed your mittens, then you’re good kittens, but i smell a rat close by. mee-ow, mee-ow, mee-ow. we smell a rat close by.