Life
Life is a characteristic that distinguishes physical entities with biological processes, such as growth, reproduction, and response to stimuli, from those that do not have such processes. It is a complex and organized system that exhibits the qualities of metabolism, growth, adaptation, response to stimuli, and reproduction.
Living organisms are made up of cells, which are the basic unit of life. These cells contain genetic material, such as DNA, that carries the instructions for the organism's development and function.
Characteristics of Life:
- Organization - Living organisms are highly organized, with cells being the basic unit of structure and function.
- Metabolism - Organisms carry out chemical reactions to obtain and use energy from their environment.
- Growth - Living organisms grow and develop, often increasing in size and complexity.
- Adaptation - Organisms are able to adapt to their environment through genetic changes over time.
- Response to Stimuli - Living organisms respond to changes in their environment through various physiological and behavioral mechanisms.
- Reproduction - Organisms can produce offspring either sexually or asexually to ensure the continuation of their species.
Study Guide:
Key Concepts:
- Cellular organization and structure
- Metabolic processes and energy production
- Growth and development in living organisms
- Adaptation and evolution
- Response to environmental stimuli
- Reproductive strategies and mechanisms
Key Terms:
Study Tips:
- Understand the fundamental characteristics of life and how they apply to different organisms.
- Review the structure and function of cells, including organelles and their roles.
- Explore different metabolic processes and how organisms obtain and use energy.
- Investigate examples of growth, development, and adaptation in various species.
- Examine how organisms respond to internal and external stimuli in their environment.
- Compare and contrast sexual and asexual reproduction in different organisms.
By understanding the fundamental characteristics of life and the mechanisms that support living organisms, you can gain a deeper appreciation for the diversity and complexity of life on Earth.
