Here's a great AP Biology resource that reviews the properties of water and their influence on living organisms. The resource included two charts that cover water properties including specific heat, evaporative cooling, cohesion, adhesion, polarity, ionization, and pH. It also includes two charts that review the math of pH and molar solutions. This resource is suitable for homework, classwork, or small group collaboration. An answer key is provided. Also included in this product is an essay on water as it relates to homeostasis. The essay can be printed and easily handed out to students since it has lines for student response. A very comprehensive and generous rubric is included for easy grading and class discussion. The essay is a remake from an old AP exam which has been embellished with the contemporary emphasis on homeostasis and feedback. This essay is easily used as a confidence building exercise because there are plenty of opportunities to get the maximum number of points.