living thing needs to have babies to stay alive. But passing
on genes to the next generation is necessary for a species'
survival. Uncover the facts about how living things reproduce
and develop, from frogs and chickens to ourselves.
the steps of human development from a single cell
into a two-trillion-celled baby by viewing 11 preserved
embryos and fetuses.
Chicken and the Egg
a visit to the chick hatchery to watch chicks break
out of their eggs or to see some newly hatched chicks.
DNA, the secret code within every cell that makes
all living things look, sound and function like