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eye color, body size, whether we Human beings have trillions of
have a beak or a mouth, and cells, and many of them have
whether we have feathers, fur, special jobs, like the ones shown
gills, or something else. This below. For this reason, cells are
process of passing on traits is sometimes called the building
called heredity. blocks of life.
The baby birds will have many of the same traits as
their mother.
A human has about 40 billion blood cells, like the
ones shown here.
Some living things require a male
and female to reproduce. Others
only need one parent passes on
Living Things Need Energy
information to the offspring, like
bacteria. Some lizards also do this: All living things need energy.
lizards (which are all female) just Some living things are able to
lay an egg, and a baby is born that produce their own energy. These
has all the same traits as the organisms are called autotrophs.
parent.
For example, plants use energy
from the sun to produce the energy
they need to grow and reproduce.
Living Things are Made of Other living things, like humans,
Cells can’t make their own food from the
sun. These organisms get energy
As different as living things look
by eating plants, or by eating
from each other, it may be hard to
animals that eat plants.
believe that we are all made of the
Organisms like this are called
same thing, but living things are all
heterotrophs.
made of cells. Cells are the
smallest parts of organisms that
are still considered to be alive.
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