1.2 Unifying Themes of Biology
All levels of life have systems of related parts.
1. System: organized group of related parts.
2 Circulatory
2.
Ci l t
system:
t
h
heartt muscle
l cell,
ll h
heartt
muscle, arteries and veins, circulatory
system
3. Ecosystem: living and nonliving parts of an
area (an ocean)
4. Symbiosis: 2 organisms interacting (moray
eel and cleaner shrimp)
1.2 Unifying Themes of Biology
Structure and function are related in Biology
1 Structures are shaped a certain way in
1.
order to perform a specific function
2. Red blood cells: smaller, disk-shaped which
allows
ll
th
them tto fit inside
i id smallll vessels
l and
d
deliver oxygen.
1.2 Unifying
y g Themes of Biology
gy
Organisms must maintain homeostasis to
survive in diverse environments
1. Temperature and other conditions are
always changing.
2. Homeostasis: maintain internal
conditions
3. Need to maintain homeostasis because
cells function best within a certain range.
4. Polar bears can maintain homeostasis
because they have hollow hair that helps
the bear retain its body heat.
5. Humans: when you get hot, you sweat
and
d lose
l
heat
h t
1.2 Unifying Themes of Biology
Evolution explains the unity and
diversity of life
g over time
1. Evolution: change
a. Size of horses
2.
Adaptation: inherited trait that gives
an advantage to organisms
a. Thorn bug on plant
3.
4.
5.
If the species survives because of the
adaptation,
d t ti
then
th it can reproduce
d
and continue the species.
Evolution is a long-term response to
the environment.
Organisms have many characteristics
in common which unites all living
things.
1.2 Unifying Themes of Biology
1.2
1
2 Main Idea Questions
1. How is structure related to function in living organisms?
a.
b
b.
Snout beetle has specialized prongs and pads on its feet. Why?
H t muscle
Heart
l iis diff
differentt ffrom arm muscle.
l Wh
Why?
?
heart
arm
2. Why is homeostasis essential for living things?
Homeostasis: ability of an organism to maintain internal environment
a Allows a species to survive in diverse and changing environments
a.