Answer:
Nocturnal animals, such as owls, tend to have wide pupils and several rod cells in their retina because wide pupil allow more light to enter the eyes and the rods cells in the retina are sensitive to dim light and are vital for night vision.
The half life of the substance is 8 hours , Option D is the correct answer.
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What is Half Life ?
Half-life is the time required by an unstable element to reduce to half of its initial value.
The term is commonly used in nuclear physics.
The formula is

N(t) = quantity of the substance remaining
N ₀ = initial quantity of the substance
t = time elapsed
= half life of the substance
The data given in the question is N ₀ = 800 moles , N(t)= 100 , t= 24 hours

Substituting values in the equation


Therefore half life of the substance is 8 hours , Option D is the correct answer.
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The freezing point of water in Celsius is 0 degrees and the boiling point is 100 degrees so the answer would be 100 degrees