1) rounded head, body and limbs a) b) c) d) 2) eyelids, external ears a) b) c) d) 3) ossification commences a) b) c) d) 4) rostral neuropore closes a) b) c) d) 5) neural folds, cardiac primordium, head fold a) b) c) d) 6) fertilized oocyte, zygote, pronuclei a) b) c) d)

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