Important levels of organization for structure and function include cells and tissues. Cells carry on the many functions needed to sustain life. They grow and divide, thereby producing more cells. This requires that they take in nutrients. Reproduction and heredity Reproduction is characteristic of all living systems.
Some organisms reproduce asexually.
All organisms must be able to obtain and use resources, grow, reproduce, and maintain stable internal conditions. Behavior is one kind of response an organism can make to an internal or environmental stimulus. Diversity and adaptations of organisms Millions of species of animals, plants, and microorganisms are alive today. Many different people in different cultures have made and continue to make contributions to science and technology. Science and technology are reciprocal.