Are there any options you can give us?
Answer:
4) It allows the exchange of nutrients between the embryo and the mother, while at the same time filtering out harmful material.
Explanation:
The placenta is an organ present in all mammals. She is confirmed between the 6th and 8th week of pregnancy and has as main function the exchange of substances between the mother and the fetus. Among these substances are nutrients, gases and even secretions. The placenta also has the function of fighting infections and promoting immunity to the fetus, in addition, it can act as the lung, the intestine and the liver, while the fetus does not develop its organs.
The correct path is:
External ear, External auditory canal, tympanic membrane, middle ear, inner ear.
Sound waves are first collected by the external ear or pinna. Sound waves then move through the external auditory canal to the tympanic membrane or the eardrum. Waves then move to middle ear which consists of the three small ear bones. The last stop is the inner ear which consists of the cochlea and auditory nerve.
