What is Life?
Life can be defined as the condition that distinguishes organisms from inorganic objects and dead organisms, being manifested by growth through metabolism, reproduction, and the power of adaptation to the environment through changes originating internally.Characteristics of Life
- Cellular Organization: All living things are composed of one or more cells.
- Growth and Development: Living organisms grow and undergo changes in form and function over their lifetime.
- Reproduction: Living organisms can reproduce and create offspring.
- Response to Stimuli: Organisms respond to their environment and can detect and respond to changes in their surroundings.
- Homeostasis: Living organisms maintain a stable internal environment despite external changes.
- Heredity: Living organisms pass on genetic information to their offspring.
- Adaptation: Living organisms can adapt to their environment through the process of natural selection.
Domains of Life
There are three main domains of life:- Archaea: Single-celled microorganisms that are similar to bacteria but have different evolutionary histories.
- Bacteria: Single-celled microorganisms that can be found in various environments.
- Eukarya: Organisms with complex cells, including plants, animals, fungi, and protists.
Life Processes
Living organisms carry out various life processes to maintain their existence:- Metabolism: The chemical processes that occur within a living organism to maintain life.
- Respiration: The process of obtaining energy from the intake of oxygen and release of carbon dioxide.
- Photosynthesis: The process by which green plants and some other organisms use sunlight to synthesize foods with the help of chlorophyll.
- Excretion: The process of eliminating waste products from the body.
- Nutrition: The process by which organisms obtain and use food for growth, maintenance, and repair.
[Life] Related Worksheets and Study Guides:
.◂Science Worksheets and Study Guides Second Grade. Science in our world
Study Guide
Science in our world 
Worksheet/Answer key
Science in our world Worksheet/Answer key
Science in our world Worksheet/Answer key
Science in our world Vocabulary/Answer key
Science in our world
Worksheet/Answer keyWorksheet/Answer keyWorksheet/Answer keyVocabulary/Answer keyThe resources above cover the following skills:
LIFE SCIENCE (NGSS)
Biological Evolution: Unity and Diversity
Students who demonstrate understanding can:
Make observations of plants and animals to compare the diversity of life in different habitats[Clarification Statement: Emphasis is on the diversity of living things in each of a variety of different habitats.] [Assessment Boundary: Assessment does not include specific animal and plant names in specific habitats.]