Fertilization
how many sperm fuse with an egg
1
pregnancy begins when the fertilized egg attaches to what?
the uterus
the first stage of human life, when a baby is born
infancy
once a sperm and egg join it is called what?
a fertilized egg
how long does human pregnancy last
9 months
the last stage in human development before adulthood
puberty
the egg is _______ than the sperm
Bigger
as an embryo develops where does it get it's nutrients
the mother
Puberty occurs in what years?
Teenage