You could have a sentence like:
Of the following choices, which would you prefer?
There is no need to capitalise the word 'koala' in a sentence. Nor do you use the word 'bear', as koalas are not bears.
regular speech
Only if it begins a sentence, in which case you should capitalize the C.
We need to amputate the leg before the infection spreads.The surgeon begins to amputate the finger.
Your question appears to be the concluding portion of a sentence which begins "People need..."
In formal writing you would not begin a sentence with because, therefore, the kind of sentence that begins with because is informal.
When the extra phrase begins with the word "and".
no because then it would be a sentence fragment.
if the word after it begins in a vowel
No, but you need to use a capital letter to start the sentence, and the word English also begins with a capital letter.
The sentence technique modeled in the eResource is called sentence variety. This involves changing the way a sentence begins in order to create interest and rhythm in writing.
No, "line manager" is not capitalized when used in a sentence unless it begins the sentence.