Find the error with subject-verb agreement. Select the incorrect verb and type it correctly.
A caravan of camels take tourists into the desert near the city of Jaisalmer
in India. Many tourists find that camel treks provide them with a special
opportunity to observe rural life.
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A caravan of camels takes tourists into the desert near the city of Jaisalmer  in India.

Explanation:

The subject and the verb must always agree in number. If a noun is singular, the verb must be singular as well. In this case, the noun phrase 'a caravan of camels' is the subject, which performs the action of the main verb. Since word 'caravan' is the head of this phrase, and it is singular, the verb form must be singular. It is, therefore, correct to say that "a caravan of camels takes tourists into the desert."

the correct answer would be:  

a. adverb phrase

either a donut or a sphere or a pancake or a flat sphere. it depends on where the vertical line is.

if the line goes through the center of the circle and is perpendicular to a diameter containing the center, then you get a flat circle.

if the line and the diameter of a the circle meet in the center of the diameter and at an angle, you get a pancake.

if the line is on the circumference of the circle and is at right angles   to the circle you get a ring.

if the line contains the diameter, you get a sphere.

the the line is parallel to the diameter and touches the circumference, you get a donut.