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Section 3: Pregnancy, Development, and Birth. What are the changes that occur to the zygote, embryo, and fetus during development? How is the developing embryo protected and nourished? What happens during childbirth? What changes occur as a person develops from infancy to adulthood?.

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section 3 pregnancy development and birth
Section 3: Pregnancy, Development, and Birth
  • What are the changes that occur to the zygote, embryo, and fetus during development?
  • How is the developing embryo protected and nourished?
  • What happens during childbirth?
  • What changes occur as a person develops from infancy to adulthood?
development before birth
Development Before Birth
  • The zygote develops into an embryo and then into a fetus. Differentiation leads to specialized cells, tissues, and organs.

Zygote

development before birth1
Development Before Birth
  • The zygote develops into an embryo and then into a fetus. Differentiation leads to specialized cells, tissues, and organs.

Zygote

Eight-Cell Stage

Hollow Ball

development before birth2
Development Before Birth
  • The zygote develops into an embryo and then into a fetus. Differentiation leads to specialized cells, tissues, and organs.

Zygote

Eight-Cell Stage

Hollow Ball

development before birth3
Development Before Birth
  • The zygote develops into an embryo and then into a fetus. Differentiation leads to specialized cells, tissues, and organs.

Zygote

Eight-Cell Stage

Hollow Ball

Stage When Folding Begins

development before birth4
Development Before Birth
  • The zygote develops into an embryo and then into a fetus. Differentiation leads to specialized cells, tissues, and organs.

Zygote

Eight-Cell Stage

Hollow Ball

Stage When Folding Begins

Embryo With Three Layers

protection and nourishment
Protection and Nourishment
  • The membranes and other structures that form during development protect and nourish the developing embryo, and later the fetus.
birth
Birth
  • There are two types of twins: identical twins and fraternal twins.