17.11 a piece of corroded metal alloy plate was found in a submerged ocean vessel. it was estimated that the original area of the plate was 800 cm2 and that approximately 2.6 kg had corroded away during the submersion. assuming a corrosion penetration rate of 200 mpy for this alloy in seawater, estimate the time of submersion in years. the density of the alloy is 7.9 g/cm3

answer: the correct answer for the fill in the blank is rods.

rods are the specialized photoreceptor cells that are present in the retina of human eye. they are responsible for vision in the night time ( also called scotopic vision). they have very low visual acuity and color distinguishing ability.

as they are responsible for vision in night time, therefore they are found predominantly in the nocturnal animals.

c) a core temperature of only ten thousand kelvin