Objectives: 1. Explain the characteristics all living things share. 2. Describe the importance of homeostasis on the body.

 Where is Life???  EVERYWHERE!!!  From the darkness of the deepest ocean floor to hundreds of thousands of year old ice in Antarctica  Life comes in many different shapes, sizes and colors

 The biosphere is made up of all living things and all of the places they are found on Earth.  Every part of biosphere is connected  Land, water, plants, animals and atmosphere

 Variety of life across the biosphere.  Increases from pole to equator.  Why???  More living things are able to survive in consistently warm temperatures than in areas that have large temp changes.  Larger, more consistent food supply for more species.

 A particular type of living things that can reproduce by interbreeding among themselves.  About 2 million different living species  10’s of millions remain undiscovered…?  Over half are insects— how many exist??  No one knows!

 Scientific study of all forms of life, or all types of organisms.  Organism—any individual living thing.  All organisms share certain characteristics: 1. Made of cells 2. Reproduction 3. Use energy 4. Evolve 5. Grow and develop 6. DNA 7. Homeostasis

 Basic unit of life.  Microscopic, single-celled organisms are most common forms of life on Earth.  Unicellular or multicellular.

 ALL organisms need a source of energy for their life processes  Energy--Ability to cause change or to do work  Some from environment, some make their own(absorb from light)  Important for Metabolism—all of the chemical processes that build up or break down materials.

 Must have ability to produce new individuals— fitness  Single celled—one cell divides into two  Multicellular— combine genetic info from two parents=YOU

 Slow change over time  Changes made to better survive in an environment

 Respond to their environmental conditions  Stimuli such as temperature, water, food supplies, light, sound….

 Maintaining a constant internal condition  Cells do this and organisms do this  Internal conditions such as pH, temperature, water balance, etc

 Maintenance of internal conditions  Temperature, blood sugar, acidity must be controlled  Breakdown in homeostasis can lead to death  Maintained through negative feedback.  Also maintained through behaviors

 Deoxyribonucleic acid— carries all of your genetic information  All organisms contain DNA  DNA codes for proteins that make up cells and do all of the work in your body

 Organisms grow by producing more cells and by cell enlargement  They develop as they mature into an adult

 A butterfly emerges from a cocoon  A lizard sleeps in the sun to obtain warmth  A runner eats a spaghetti dinner the night before the race  Rust forms on an iron nail  Wood is made up of the cell walls that separated tree cells  A piece of paper is cut in half to form two smaller pieces  A bird lays an egg that will hatch into a baby bird  A tadpole gradually changes into a frog  Birds fly south to find food in the winter  A green plant converts water and carbon dioxide into sugar  A spider lays its eggs in an egg sac  A bacterium divides to form two bacteria