This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Institut for Naturfagenes Didaktik University of Copenhagen DSC. Institut for Naturfagenes Didaktik University of Copenhagen Copenhagen Denmark Daderot Daderot cc cc Institut for Naturfagenes Didaktik
Page 2023 Free-images.com. All images are Public Domain