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Human fertilization is the union of an egg and sperm, occurring primarily in the ampulla of the fallopian tube. [1] The result of this union leads to the production of a fertilized egg called a zygote, initiating embryonic development. Scientists discovered the dynamics of human fertilization in the 19th century. [2]
The New Ballard Score allows scores of −1 for the criteria, hence making negative scores possible. The possible scores then range from −10 to 50, the gestational range extending up to 20 weeks. (A simple formula to come directly to the age from the Ballard Score is Age=((2*score)+120)) / 5. Maturity Rating:
As would be expected from an adaptive behavior measure (i.e., ABAS-II) that was developed independently of the Bayley-III, the floor for the Adaptive Behavior scale extends downward to a composite score of 40 (extending upwards to a score of 160), whereas the remaining Bayley-III floor composite scores are relatively higher (Cognitive, 55–145 ...
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The sperm (being one of approximately 250 million sperm in a typical ejaculation) travels through the vagina and cervix into the uterus or fallopian tubes. Only 1 in 14 million of the ejaculated sperm will reach the fallopian tube. The egg simultaneously moves through the fallopian tube away from the ovary.
Both lady and man ostriches take turns incubating the eggs and caring for the baby chicks. In some cases, a dominant male and female will raise a group of chicks from several different parents.
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A baby born within the normal range of weight for that gestational age is known as appropriate for gestational age (AGA). An abnormally slow growth rate results in the infant being small for gestational age, while an abnormally large growth rate results in the infant being large for gestational age.