The nationally recognized credit-by-exam DSST® program helps students earn college credits for learning acquired outside the traditional classroom such as learning from on-the-job training, reading, or independent study. DSST® tests offer students a cost-effective, time-saving way to use the knowledge they've acquired outside of the classroom to accomplish their education goals. This book provides a general overview of the subjects students will encounter on the exam such as ecological concepts, environmental impacts and conservation. This valuable resource includes: diagnostic pre-test with detailed answer explanations; Assessment Grid designed to help identify areas that need focus; Subject Matter Review proving a general overview of the subjects, followed by a review of the relevant topics and terminology covered on the exam; post-test offering 60 questions all with detailed answer explanations; and key information about the DSST® such as, what to expect on test day and how to register and prepare for the DSST®.