Read fully to understand the verified-certificate option. Join Professor Eric Lander and the MITx Biology team in an exciting learning experience available for free to all enrolled learners. The 7.00x Introductory Biology course materials are available for exploration and completion by registering as an auditor or verified-track learner, including video, interactive problem sets, and exams. We strongly encourage you to work through the activities, towards a goal of learning biology. We have optimized the course settings for learning: instant feedback after trying problems and all content available at all times for self-paced progress. You receive feedback on correctness of answers, but the problem submissions do not count toward the grade for a certificate. Instead, we offer a thorough and robust means of certifying edX learners in their mastery of the MITx introductory biology content, through a the MITx 7.00x Introduction to Biology Competency Exam. This challenging option is available only to those who register for the verified-certificate track, and successful completion of this exam is the only assessment that counts toward a certificate. We highly recommend preparing for the Competency Exam certification by using the current course materials and MIT OpenCourseWare problems. The next Competency Exam will be open October 27, 2020 to November 3, 2020.