Asymbol that represents a speech sound and is a unit of an alphabet?

I would say a letter as it represents a speech sound and is part of an alphabet. For example the letter "u" can be a 'you' sound or an 'uh' sound depending on whether it is in a word like "universal"  or in say  the word "but"

Explanation:

That is still k. The speech noise k is in the elements written ask but in the phonetic alphabet, according to the IPA, it is still k. Spelling a letter based on the alphabet and writing it in the universal phonetic characters is often another, but for it is equal.

innocence can be defined as the lack of sin, relating it with the lack of guilt, also it can be a synonime of naivety. most people agree that sins are made out of experiences, intentionally or not, as well as you stop being naive once certain things happen to you throughout your life. so, with this explained, the chosen answers are:

when the boy saw the effects of war, he no longer viewed life as innocent.

the loss of innocence is a result of gaining experience and making mistakes.

one way to define innocence is as a lack of worldly experience or sophistication.