Question: Review the images and text about stages 13 about 32 days and 23 about 53-58 days, and compare the limb development at these stages.Answer: In stage 13, all four limb buds are present. In stage 13, the upper limb buds resemble flippers. In stage 23, the upper limb shows well-formed arm, elbow, wrist, and fingers. In stage 23, the lower limb shows well-formed toes, feet, and knees.