Kara is writing a science-fiction story. in the story, earth no longer experiences day and night.
to return earth to normal, which action should the heroine of the story take?
a. she should get the sun to travel around earth again.
b. she should make earth start moving around the sun.
c. she should get earth spinning on its axis again.
d. she should get the shape of earth’s orbit back to normal.

C. She should get the Earth spinning on its axis again.

Explanation:

The Earth experiences day and night because of its spinning on its own axis.

If Kara's science-fiction story doesn't have the Earth spinning on its own axis, then the Earth will not experience day and night and hence Kara should incorporate this idea into his story.

(C) She should get Earth spinning on its axis again.

Explanation:

chemical properties of thing

no. dot product   =0 when vecs at right angles