The Monarch's Forest Ecosystem Mexico's Oyamel Fir Forest (Back to Lesson) National Science Education Standards Life Science Organisms have basic needs. The world has many different environments, and distinct ones support the life of different types of organisms. (K-4) Regulation of an organism's internal environment involves sensing the internal environment and changing physiological activities to keep conditions within range required to survive. (5-8) Biological evolution accounts for the diversity of species through gradual processes over many generations. Species acquire many of their unique characteristics through biological adaptation, which involves the selection of naturally occurring variations in populations. Biological adaptations include changes in structures, behaviors, or physiology that enhance survival and reproductive success in a particular environment. (5-8) Earth Science Weather changes from day to day and over the seasons. Weather can be described by measurable quantities, such as temperature, wind direction and speed, and precipitation. (K-4) National Geography Standards How to use maps and other geographic representations, tools, and technologies to acquire, process, and report information.   Copyright 2006 Journey North. All Rights Reserved. Please send all questions, comments, and suggestions to our feedback form