Human pregnancy typically lasts weeks and is divided into trimesters. A fetus with XX chromosomes is a while a fetus with XY chromosomes is . A fertilized egg is called a ___ . After it attaches to the uterus wall it is called a . Name the 2 functions of the placenta: Name 2 things that happen during the second trimester: Name 2 things that happen during the third trimester: Increased and help with understanding of safe pregnancies.

a tetrad is the foursome during meiosis made by two homologous chromosomes that have each already replicated into a pair of sister chromatids.

emerging idea only occurs as a raw idea that could appear out of nowhere. meanwhile, to reach scientific consensus , that idea must be structured and tested over and over again through various experiments. the scientific consensus transforms the raw idea into idea that is more reliable through the process of scientific elimination.