Ключевые слова: adult, animal, audience, biologist, biology, board, classroom, clinic, close, cognize, college, concept, discussing, dna, education, eyes, feelings, female, girl, happiness, healthy concept, knowledge, lab, laboratory, learn, life on earth, person, place for text, pure, reaction, research, school, scientist, shell, space, specialist, study, studying, toothy smile, training, white, woman,