serves as shock absorber;

• - fetus moves around

THE DEVELOPMENT OF THE LIFE STAGES OF EARLY EMBRYOTIC ANIMAL DEVELOPMENT

• - the embryo is about 1.2 inches long

⁃ union of sperm cell and egg cell

⁃ formation of early embryo.

FORMATION OF ALL MAJOR ORGANS once the germ layers have formed

⁃ fertilized egg undergoes a series of MITOTIC CELL DIVISIONS

• eyelashes are formed; eyelids can be recognized

• - where embryo floats;

• - an implanted blastocyst; initial development stage of humans.

⁃ the next stage when the SPERM PENETRATES AN EGG then FUSION OF THEIR NUCLEUS takes place.

HTE PROCESS OF FERTILIZATION

⁃ process of attachment of blastocyst to the uterine wall

⁃ the first stage of animal development

• AMNIOTIC SAC a sac of thin sheet of tissue that

⁃ the formation of the gamete.

⁃ zygote travels to — (will undergo 1ST MITOTIC DIVISION to form CLEAVAGES)

• - bond that holds the embryo to the wall of the uterus

⁃ in FERTILIZATION produces — (fertilized egg)

⁃ recognizable human form (—)

⁃ formation of organs in the body

⁃ zygote travels — (Cleavages will transform into MORULA) Later on, it will develop into a —

⁃ SPERM AND EGG FORM AND DEVELOP inside the reproductive systems under the control of —

⁃ the ORGANS acquire their unique STRUCTURES and CHEMICAL properties

⁃ GASTRULATION CELL MIGRATION patterns in the embryo to form two or more primary —

• - fingerprints are acquired

⁃ the baby is ready to be born

⁃ process of CELL DIFFERENTIATION

• all organs have been developed.

• - embryo's lifeline; where the embryo gets its D and food from mother

helps embryo to maintain temperature