CHARACTERISTICS OF LIFE
Defining what it means to be alive
7th grade science
The total of all chemical reactions and life processes that allow an
organism to take care of itself.
Everything that happens in your cells is a set of chemical
Responding to the
Living things can monitor (perceive) and respond to changes in
their internal and external environment.
Sometimes they can adapt to these changes, sometimes they
The movement of an organism towards food, water, shelter,
Organisms build big things from little things
They make large molecules that they need from smaller
Movement of stuff within the organism
Like blood through our arteries and veins
Burning food for fuel
sugar + oxygen ---> carbon dioxide + water + energy
Living things obtain energy from their environment.
Photosynthesis is key:
carbon dioxide + water -----------> sugar + oxygen + water
More cells and bigger cells
Humans start as 1 cell and grown and develop into an organism
of about 50 trillion cells.
Getting rid of waste
4 types of excretion
Living things come from other living things.
Living things make copies of themselves.
Asexual reproduction - only 1 parent
Sexual reproduction - two parents