Welcome to the Electronic Frontier Classroom of the 21st Century. All living things are made up one or more cells. Beginning in the 17th century, curious naturalists were able to use microscopes to study objects too small to be seen with the unaided eye. You will be provided with an unlimited number of attempts to gain knowledge and test-taking skills. Each attempt randomly selects new questions and answers.
I wish you well in your biology studies involving cell function and structures of animal and plant cells.
GOOD LUCK!