Khan Academy is great! Also, Alison (it's a website) has some free courses as well.
38 ATP is produced during cellular respiration
I am sorry I can only answer 7 for you.
Hope it helps
7= By replacing the neurons lost from a injury with new cells.
Answer:
The outside only looks pigmented because of the color reflecting off it, but the inside is white and unpigmented because it is reflecting all the colors. Does this help?