-
Period: to
zygote
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Period: to
Embryo
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Period: to
fetus
-
heart develops right and left chambers.
-
bones are visible. heartbeat can be heard with a stethoscope.
-
fingerprints form.
-
infant begins to crawl.
-
Period: to
infancy
-
Period: to
skin starts to becom wrinkled
-
heart beats regularly. eyes and ears begin to form.
-
Period: to
childhood
-
Period: to
puberty
-
Period: to
Adolescence
-
Period: to
Adulthood
-
skin starts to become wrinkled
-
aging begins.