Answer:
The sun is located at one of the two foci in the shape of Earth's orbital path
Explanation:
The answer to fill up the blank is foci.
Brains of alzheimer victims display plaque, which are BETA AMYLOID PROTEIN and tangles, which are TAU PROTEIN. Alzheimer is a neuro-degenerative disease in which brain cells are progressively destroyed, leading to memory loss and dementia.
B. I think thats right :/