What is Life?

How is an organism living?  There are 6 characteristics of life  Organization, chemical composition, energy, responds to surroundings, grow and development, reproduce  There are 4 needs of living things  Water, food, living space, homeostasis  There are 6 characteristics of life  Organization, chemical composition, energy, responds to surroundings, grow and development, reproduce  There are 4 needs of living things  Water, food, living space, homeostasis

Cell Organization  Cells are basic building blocks of life  Organisms are either multicellular or unicellular  There are five levels of cell organization: Cells, tissues, organs, organ systems, organism  Cells are basic building blocks of life  Organisms are either multicellular or unicellular  There are five levels of cell organization: Cells, tissues, organs, organ systems, organism

Chemicals of Life  All organisms are composed of chemicals  Carbohydrates (energy source)  Proteins  Lipids  Nucleic Acids (genetic material)  All organisms are composed of chemicals  Carbohydrates (energy source)  Proteins  Lipids  Nucleic Acids (genetic material)

Use of Energy  Organisms must use energy to perform functions

Respond to Surroundings  Organisms react to their environment and changes in the environment

Grow and Develop  Organisms grow to become larger  Development is a change that occurs during the organisms life to produce a more complex organism  Organisms grow to become larger  Development is a change that occurs during the organisms life to produce a more complex organism

Reproduce  Organisms reproduce to produce offspring to continue to survive

Needs of Organisms  Water: organisms can’t survive without it  Food: organisms need a source of energy to survive  Living space: organisms need a place to get food, water, and shelter  Stable internal conditions: (homeostasis) organisms must be able to keep their bodies stable  Water: organisms can’t survive without it  Food: organisms need a source of energy to survive  Living space: organisms need a place to get food, water, and shelter  Stable internal conditions: (homeostasis) organisms must be able to keep their bodies stable