, * VIEW OF LIFE
biology-scientific study focuses all
that on
understanding aspects of living organisms
biologists study life from molecular level
large-scale ecological interactions
↳ =
to
three main themes :
evolution central theme of
biology explains how life adapts
/changes over time
:
;
process that relies
nature of science on experiments and
hypothesis testing
:
to validate
findings
is interconnected in similarities in
biological systems life many ways ; e
genetics or
:
g
.
.
in
cycling of nutrients ecosystems
Atom
Smallest unit of an element composed of
electrons ,
protons and neutrons
,
V
Molecule
CHARACTERISTICS OF LIFE Union of two or more atoms
of the same or different elements
V
Cell
The structural and functional
of life
organization
=
unit of all living organisms
V
atom >
-
moucules >
-
cells =
most basic units of life Tissue
* group of cells with a common
us cell is alive but made from non living morecules
structure and function
V
live
cells
independently single-celled
↳ Organ
some , some
Composed of tissues functioning
together for a specific task
organisms clump together and form colonies V
Organ System
multicellular
many living organisms
are Composed of several organs
working together
V
Organism
complex individuals
previous and An individual ;
level
gets
each builds one
up on contain organ systems
and complex
V
more more
Species
A group of similar, interbreeding
level
hierarchy
↳ in each
moving up gains
organisms
,
V
characteristics
emergent properties unique = , Population
Organisms of the same species
by interactions between individual
in a particular are a
determined
community
parts Interacting populations in a particular area
interconnected function
V
↳ levels
all are ,
as
systems A
Ecosystem
community plus the physical environment
V
Biosphere
LIVING ORGANISMS MAINTAIN HOMEOSTAS IS Regions of the Earth's crust,
waters , and atmosphere inhabited
by living organisms
(homeostasis) for survival of temperature,
Organism
balance essential
biological .
g
; e .
moisture level , -o must within certain tolerance
acidity stay range
↳) maintained feedback/control mechanisms
by
many organisms depend on behavior to
regulate internal environment