The stratum germinativum is composed of several layers with special cells that produce a dark skin pigment called:
A. granules
B. melanin
C. elongated
D. keratin
Select your answer:
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Respiration, Immune System, Blood Cells › ViewWhat happens after the second time you are exposed to a pathogen?
A. The body will not be able to fight off the pathogen quickly, because it knows how to get into the body easier.
B. The body’s immune system will react the same was as it did during the first exposure.
C. The body can only be exposed to a pathogen a second time if you do not have a vaccine.
D. The body will know how to fight off the pathogen quickly, because memory cells have been created after the first encounter.
Vision and Hearing Defects › View
What are refractive errors in vision primarily due to?
A. Changes in the auditory canal.
B. Alterations in the shape of the cornea or lens.
C. Damage to the optic nerve.
D. Fluctuations in ambient lighting.