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What is LIFE? 8.19.15 Is fire alive? So what is life??? 1: Living things are composed of cells All living things have cells 1: Living things are composed of cells All living things have cells Cells are never formed by nonliving things 2: Living things reproduce All living things die, so reproduction is necessary 2 types: 2: Living things reproduce All living things die, so reproduction is necessary 2 types: Sexual two cells from different individuals unite to produce new cell (new individual) 2: Living things reproduce Asexual - single organism reproduces without the aid of another. More simple some organisms simply divide in two. 3: Living things grow and develop All living things are capable of growth 4: Living things use and obtain energy Living things obtain energy from their environment. Different methods?? 4: Living things use and obtain energy Photosynthesis – energy derived from sun Metabolism energy from food Chemosynthesis energy from chemical sources 5: Living things respond to their environment Can be fast (behavior), or slow (metabolism or growth) 5: Living things respond to their environment Can be fast (behavior), or slow (metabolism or growth) Cause of change called stimulus 5: Living things respond to their environment Can be fast (behavior), or slow (metabolism or growth) Cause of change called stimulus Living things respond in ways that improve chances of survival Homeostasis The processes by which organisms respond to stimuli in ways that keep their body suitable for life Examples in humans? Homeostasis The processes by which organisms respond to stimuli in ways that keep their body suitable for life Humans: warm blooded, sweat, shivering, sickness, waste excretion, etc. Other aspects of life? Other aspects of life? All things die Other aspects of life? All things die Based on DNA Other aspects of life? All things die Based on DNA Communicate Other aspects of life? All things die Based on DNA Communicate Organization Other aspects of life? All things die Organization Based on DNA Gas exchange Communicate Other aspects of life? All things die Organization Based on DNA Gas exchange Communicate Evolve
