If you wanted to create a blurred background effect when taking a portrait, then it is a good idea to include more back ground in your picture.
Answer:
A faster shutter speed will make an image darker, as it makes less time for the light to come in.
Explanation:
The spread of religious works of at helped spread the awareness of the religion. For example, the Christian church's had many artists produce famous artworks to have people recognize the church/religion and come back.
It's usually in tonic key