State one reason why some species might have similar body structures even if they are not closely related.

A reason would be the function: some body structures are good for some functions.

For example, a Giraffe is tall to be able to eat from the tree tops. Another animal might get a selective advantage of being tall and might develop a long neck, because the leaves from tree tops might support the taller individuals in survival.

So some structures are adaptive in some environments and might arise independently.

Hydrosphere is the correct answer

The right answer is c.sandstone.