Which uses high-frequency sound waves to make an image of a developing fetus? a. ectopic pregnancy b. chorionic villus sampling c. ultrasound d. amniocentesis

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Mucous membranes.. a. cover or line external surface of body. b. line internal body surfaces that are in contact with the environment. c. produce antibodies to combat infection. d. secrete sweat, which has antibacterial enzymes.

Complete each statement about nutrition. a good strategy for meeting the nutrient needs of an infant is to . vitamin d during childhood is an important nutrient to .