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How does pregnancy begin? a) a placenta forms in the uterus b) a sperm reaches an egg in the fallopian tubec) the blastocyst differentiates into two cell types d) contractions begin in the uterine wallapex

What type of specimens where you able to see under each of the microscopes in the microscope activity

Models are non-visual ways of coummincating how someone thinks about something in the natural world