NATURAL SELECTION
Natural Selection
When you see things change, they don't change for survival. Organisms don't actively adapt- rather random, genetic changes (mutations) that are helpful allow an organism to survive and pass on its genes. (Most mutations are bad and just die out.)
Physical change: cliques (bonded atoms in a molecule) stay together (A water molecule in vapor is the same cluster of 2 Hydrogens and one Oxygen as a water molecule in ice, only it is wiggling faster in the vapor form and far from other water molecules.)
ex: the same group of friends remain together regardless of setting (recess, lunch, reading centers, etc)
Chemical change: cliques (molecules) break apart to make new friendships (molecules) ( We mix baking soda and vinegar and get carbon dioxide bubbles.)
ex: cliques in a school changing over time
Calories: how much energy is in a certain food
Viruses: flu, cold, polio, chicken pox
Bacteria: strep throat, staff infection
Antibiotic Resistance:
Natural Selection
- Random genetic changes (mutations)
- Some do better than others
- Ones that survive pass on their genes
When you see things change, they don't change for survival. Organisms don't actively adapt- rather random, genetic changes (mutations) that are helpful allow an organism to survive and pass on its genes. (Most mutations are bad and just die out.)
Physical change: cliques (bonded atoms in a molecule) stay together (A water molecule in vapor is the same cluster of 2 Hydrogens and one Oxygen as a water molecule in ice, only it is wiggling faster in the vapor form and far from other water molecules.)
ex: the same group of friends remain together regardless of setting (recess, lunch, reading centers, etc)
Chemical change: cliques (molecules) break apart to make new friendships (molecules) ( We mix baking soda and vinegar and get carbon dioxide bubbles.)
ex: cliques in a school changing over time
Calories: how much energy is in a certain food
Viruses: flu, cold, polio, chicken pox
Bacteria: strep throat, staff infection
Antibiotic Resistance:
- Bacteria makes you sick
- Take antibiotic to kill weak ones
- Strong ones escape and survive to pass on strong genes (naturally strong by chance) (can happen through sneezes)
Chemical Change
Making Sugar in Photosynthesis burning gasoline burning wood rotting animal rusting steel mixing a cracker with spit mixing baking soda and vinegar turning beans into a fart baking a cake |
Physical Change
Melting Ice boiling water tearing paper cracks in sidewalk popping popcorn puddle evaporating chewing food dissolving salt in water |
Chemical and Physical Changes Article by Kimberly Lott and Anitra Jensen http://asulearn.appstate.edu/pluginfile.php/277176/mod_resource/content/1/chemical%20and%20physical%20changes.pdf
Happy Scientist: "Changing How We Look at Changing"
http://thehappyscientist.com/science-experiment/changing-how-we-look-changing
Dissolving Salt in Water Animation
http://mw2.concord.org/public/student/solution/dissolve.html
Happy Scientist: "Changing How We Look at Changing"
http://thehappyscientist.com/science-experiment/changing-how-we-look-changing
Dissolving Salt in Water Animation
http://mw2.concord.org/public/student/solution/dissolve.html