What is LIFE?

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 non- living things  All living things have cells  Cells are never formed by non- living things

2: Living things reproduce  All living things die, so reproduction is necessary  2 types:  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)  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.  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??  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  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  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  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?  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.  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?

 All things die

Other aspects of life?  All things die  Based on DNA  All things die  Based on DNA

Other aspects of life?  All things die  Based on DNA  Communicate  All things die  Based on DNA  Communicate

Other aspects of life?  All things die  Based on DNA  Communicate  All things die  Based on DNA  Communicate  Organization

Other aspects of life?  All things die  Based on DNA  Communicate  All things die  Based on DNA  Communicate  Organization  Gas exchange  Organization  Gas exchange

Other aspects of life?  All things die  Based on DNA  Communicate  All things die  Based on DNA  Communicate  Organization  Gas exchange  Evolve  Organization  Gas exchange  Evolve