When inhaled, crystalline silica can cause scar tissue to form on what organs?
a. eyes
b. heart
c. lungs
d. sinuses?

Option C, Lungs

Explanation:

When silica dust is inhaled it causes silicosis which in severe cases is disabling. When Silica enters the lungs , scar tissues are formed which lead to difficulty in taking oxygen. This problem usually arises when crystalline silica is inhaled continuously for a period of 15 to 20 years. Its symptoms are not visible and thus can only be determined through chest X-Ray. However, after prolonged exposure lung dysfunctions causes breathing problem, fatigue, chest pain or  respiratory failure

Hence, option C is correct

option a is correct i.e.

explanation:

in context to the membrane of nerve impulse, the outer membrane of neuron is semi permeable that is only sodium ions can pass through the membrane i.e. smaller ions can pass through the membrane while larger ions cannot pass through it.

well we can't tell you because we cant see the time give a screen shot or something.