An object located behind the focal point of a convex lens forms a(an)
a. enlarged real image.
b. reduced real image.
c. enlarged virtual image.
d. reduced virtual image.

Enlarged real image.

A converging lens always has a positive focal point so the light rays always converge on the real side of the lens, creating a real image.

It will also be enlarged because when you draw a ray diagram you can see that the image will be about two times or so larger depending on where the position of the object actually is. Usually when an image is reduced, it is when it is a diverging / concave lens.

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The answer is that they are composed mostly of liquid water.