Answer:
I repeat only the last word you say. The more I repeat, the softer I got. I cannot be seen but can be heard. What am I?
People need me yet they give me away every day.
You throw away my outside you cook my inside. Then you eat my outside and you throw away my inside.
My head bobs lazily in the sun. You think I'm cute, for my face is yellow, my hair is white and my body is green. What am I?
I am perfect with a head perfect without a head; Perfect with a tail perfect without a tail; Perfect with either neither or both.
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?