The period of the zygote ends when the zygote implants in the lining of the wall of the uterus

Marie suffers from excessive earwax. What type of deafness is she likely to experience?

a) excessive earwax is not serious enough to lead to deafness b) central deafness c) sensorineural deafness d) conduction deafness

What is a possible cause of conduction deafness?

a) tumors b) meningitis c) excessive earwax d) damage to the brain's auditory pathways