To answer this specific question,
pregnancy is an example of positive feedback. I am hoping that this answer has
satisfied your query and it will be able to help you in your endeavor, and if
you would like, feel free to ask another question.
Forest fires actually help the environment, they remove plants and trees that are useless and leave space for new plants and trees to grow. After 26 years after the fire, the forest will start to grow again and will be green once again.
Have a nice day! :)
Answer:
Polar molecules must contain polar bonds due to a difference in electronegativity between the bonded atoms.
Explanation: