Levels of Anxiety of High School Students when Learning Biology during the Covid-19 Pandemic - Ghasani, Tita Azizah; Department of Biology Education, Faculty of Education and Teacher Training, IAIN Syekh Nurjati Cirebon (Tadris Biologi Fakultas Ilmu Tarbiyah dan Keguruan IAIN SYEKH NURJATI CIREBON, 2021)