Transcript Chapter 2: It`s Alive!!

Chapter 2: It’s Alive!! Or Is it??
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How are living things alike?
Even though an amazing variety
of living things exist on Earth,
they are all alike in several ways.
We will study the six common
characteristics of all living things,
along with the four basic needs of
all living things.
6 Characteristics of All Living Things
1. LIVING THINGS HAVE CELLS
A CELL is a membrane covered structure
that contains all of the materials necessary
for life
Some organisms are single celled organisms,
made up of only one cell
Some organisms are made up of trillions of
cells.
2. Living Things Sense and Respond to
Change.
A change in an organism’s environment
that affects the activity of the organism is
called a STIMULUS
A stimulus can be chemicals, gravity, darkness,
light, sounds, tastes, or anything that causes an
organism to respond in some way.
HOMEOSTASIS – is the maintenance of a
stable internal environment.
Even though the external environment may
change, we must maintain a stable internal
environment
3. Living Things Reproduce.
Organisms make other organisms like
themselves
Either by ASEXUAL REPRODUCTION –
where a single parent produces offspring
that are identical to the parent
Or by SEXUAL REPRODUCTION – two
parents produce offspring that share
characteristics of both parents
4. Living Things Have DNA
deoxyribonucleic acid
The cells of all living things contain DNA
DNA provides instructions for making
molecules called proteins
Proteins take part in almost all of the
activities of an organism’s cells
HEREDITY – the transmission of
characteristics from one generation to the
next
5. Living Things Use Energy
Metabolism – an organisms metabolism is
the total of all the chemical activities that it
perfoms.
6. Living Things Grow and Develop
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