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What is Biology? Chapter 1 Characteristics of life outline Biology: Organisms: 1. Organization cells -> ___ ___ ___ specialization 2. Reproduction asexual sexual 3. Growth Development 4. Adjust Stimulus/Response Homeostasis 5. Adapt/Evolve • Biology: –study of life • Organisms: –living things What determines life? • 5 characteristics that all living things must have! 1. Organization: • Made of cells!! • Cells tissues organs organ systems • Single-cell organisms have everything they need to be self-sufficient. In multicellular organisms, specialization increases until some cells do only certain things. 2. Reproduction: • must occur for a species to survive Species ·Organisms that look alike and can mate among themselves. Same Species Not Same Species Reproduction can be: --Asexual: One parent makes identical offspring. • Sexual – two parents, offspring is hybrid of those parents 3. Growth/ Development: • Growth: –Increase in size • Development: –Changes from embryo to adult 4. Adjust to Surroundings: • Stimulus: triggers a reaction • Response: the reaction to the stimulus. • Homeostasis: – Regulate internal environment – Ex. Sweating when hot, shivering when cold 5. Adapt/ Evolve: • Adaptations are traits giving an organism an advantage in a certain external environment. Ex. Polar bears have thick fur, fish have gills • Survival of the fittest! Locomotion (Movement): • Not all organisms move (ex. Sponge is an animal that is sessile; mushroom is fungi that does not move from place to place.)