Answer:
B: bird is to nest as bear is to cave.
I'd say vocation as the definition of it is a strong feeling of a career... so, I'd say D.
Answer:
answer is write observations in a notebook
Answer:
a concave lens is exactly the opppostie with outer surfaces curving inward, so it makes parallel light rays curve outward or diverge. That's why concave lenses are sometimes called diverging lenses. ... The distance from the center of the lens to the focal point is, again, the focal length of the lens.
Explanation: