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Key Terms
Zygote
A fertilized _____, just a single cell, but it's got all your genetic material!
Embryo
From about 2 to 8 weeks, this is where _____ start to form and the heart begins to beat.
Fetus
From 9 weeks until _____, it's all about growth and refinement.
Teratogen
Anything that can _____ the developing baby, such as alcohol, drugs, or certain viruses.
Maturation
Biological growth processes that enable orderly changes in behavior, relatively uninfluenced by _____.
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