1-2 Themes in Biology
Diversity & Unity of Life
• Diversity: There’s lots of different living
things.
• Unity: All these different living things have
certain things in common
– A genetic code
– These relationships can be shown with a “tree
of life” model.
Three Domains
• 3 Categories of all living things
– Bacteria, Archae, & Eukarya
• Another way to categorize living things is
the “Kingdom” system
– 6 Kingdoms
– Animalia, Plantae, Fungi, Protista, Bacteria,
Archaea
Interdependance
• Organisms & their environment interact
• Ecology studies this
• Ecosystems are communities of living
things and their environments
• Humans really interact with the
environment
Evolution of Life
• You will change during your life
• All of humanity will change over several
generations
• This explains the branches of the tree of
life
Natural Selection
• Some organisms have certain favorable
traits that make them better able to survive
and have more kids that survive.
• Over time there will be more of these kids
and the population will start to look
different.
• Differential Reproductive Success
1. Name 3 Unifying themes of biology
• How is the unity and diversity in the living
world represented as a model?
• I.D. the 3 domains
• How are organisms interdependant?
• Describe why evolution is important in
explaining the diversity of life?
• What is the difference between evolution
and natural selection?
• Fossil evidence shows that bats
descended from shrewlike organisms that
could not fly. Write a hypothesis for how
natural selection might have led to flying
bats.