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The World of IaN pg. 13 MAIN IDEAS Biology 1. 2. 3. Cells Organization Characteristics of Life 4. Energy Use 5. Homeostasis 6. Growth 7. Developement 8. Reproduction 9. Responsiveness 10. Evolve Objective: Identify & discuss the characteristics of life using articles to identify biotic & abiotic factors. “Perfection is not attainable but if we chase perfection we can catch excellence.” - Vince Lombardi The World of Biology Chapter 1.2 KAHOOT 1-3 2 Characteristics of Life Copyright Cmassengale 3 Characteristics of Life IaN pg. 12 Life 4 Cells All living things are composed of cells In multicellular organisms, many are specialized to perform specific functions Cells are always very small The size of multicelled organisms depends on the number of cells NOT their size Copyright Cmassengale 5 Organization Organized at both the molecular and cellular levels Take in substances from the environment and organize them in complex ways Specific cell structures (organelles) carry out particular functions Copyright Cmassengale 6 Copyright Cmassengale 7 In multicellular organisms, cells and groups of cells (tissues) are organized by their function Cells tissues Tissues organs Organs systems Systems ORGANISM 8 IaN pg. 12 Levels of Organization YOUR EXAMPLE INCLUDING DRAWING & NAMES YOUR EXAMPLE INCLUDING DRAWING & NAMES YOUR EXAMPLE INCLUDING DRAWING & NAMES YOUR EXAMPLE INCLUDING DRAWING & NAMES YOUR EXAMPLE INCLUDING DRAWING & NAMES YOUR EXAMPLE INCLUDING DRAWING & NAMES Copyright Cmassengale 9 Energy Use Use energy in a process called metabolism Sum of all chemical processes Require energy to maintain their molecular and cellular organization, grow and reproduce Copyright Cmassengale 10 Homeostasis Maintain stable internal conditions Temperature, pH, etc. Copyright Cmassengale 11 Growth Grow occurs as the result of cell division and cell enlargement Cell division is the formation of two cells from a preexisting cell New cells enlarge as they mature When a cell grows to a size where its surface area isn’t big enough for its volume, the cell divides Copyright Cmassengale 12 Development The process by which an adult organism arise is called development Repeated cell divisions and cell differentiation Copyright Cmassengale 13 Reproduction All species have the ability to reproduce Not essential to survival of individual but is essential for continuation of a species Copyright Cmassengale 14 Responsiveness Respond to stimuli in the external environment Detect and respond to changes in light, heat, sound and chemical and mechanical contact Coordinates it’s responses Copyright Cmassengale 15 Evolve Ability to adapt to their environment through the process of evolution Favorable characteristics are selected for and passed on to offspring Called adaptations Driven by natural selection or “survival of the fittest” Copyright Cmassengale 16 Characteristics of Life IaN pg. 12 Evolve • • Development • Cell Differentiation Responsiveness Evolution Adaptations Cells • Specialized • Small • Respond to Stimuli Life Reproduction • Self Generating Energy • Metabolism Homeostasis • Internal Stability Organized Growth • Cell Division • Molecular • Cellular • Organelles 17