Keywords
12-13 years, 14-15 years, 60-64 years, alertness, anatomical model, anatomy, asking, bavaria, biology class, blackboard, caucasian appearance, classroom, color, communication, desk, education, five people, germany, girls, guidance, hand raised, high school, high school student, horizontal, human skeleton, indoors, knowledge, learning, manching, part of, photography, pointing, science, science and technology, selective focus, senior men, series, solution, some under 18, teacher, teaching, teenage boys, teenage girls, togetherness, toothy smile, stock image, images, royalty free photo, stock photos, stock photograph, stock photographs, picture, pictures, graphic, graphics, fine art prints, print, poster, posters, mural, wall murals, 943039