Hummingbirds Flower-Powered Migratory Species Compare and Contrast   (Back to Lesson) National Science Education Standards r Inquiry Use data to conduct a reasonable explanation. Develop descriptions, explanations, predictions, and models using evidence. Life Science Organisms have basic needs. They can survive only in environments in which their needs can be met. Each plant or animal has different structures that serve different functions in growth, survival, reproduction. The behavior of individual organisms is influenced by internal cues (such as hunger) and by external cues (such as a change in the environment). All animals depend on plants. Some animals eat plants for food. Others eat animals that eat plants. An organism's behavior patterns are related to the nature of that organism's environment, including . . . the availability of food and resources.   Facebook Pinterest Twitter © 1997 – 2019 Journey North. All rights reserved.