Which sentence demonstrates the correct use of an apostrophe? a sea star is an echinoderm because it’s body has five sections that are arranged around a central disk. sea star’s spines are made of calcium carbonate plates, which protect the creature from birds, fish, and sea otters. close observers will notice that, though sea stars appear to float, they’re actually propelled by tiny tube feet. sea stars have an amazing ability to drop their arms when threatened by a predator—but then regenerate new one’s

Close observers will notice that, though sea stars appear to float, they’re actually propelled by tiny tube feet.

Explanation:

In the chosen sentence, the apostrophe is used to make a contraction of the verb are with the subject pronoun they.

The rest of the options are incorrect because in the first sentence the spelling should be its (possessive adjective) instead of it's (it is); in the second alternative the right spelling should be stars' spines, since it stars is a plural noun; while in the last statement the correct version is ones, as it refers to arms.

sufficient and relevant

explanation: