Answer:
It is not a sentence.
Step-by-step explanation:
"the majestic sea turtle" consists of a lone fragment. To make it a complete sentence, you must add a verb/action to the subject... this will give meaning to the phrase and make it a logical sentence.
ex 1) The majestic sea turtle was cruelly misshapen due to rings of plastic litter floating in its habitat.
ex 2) The majestic sea turtle attempted to swim, but fragments of sharp metal clung to its forelimbs and impeded its graceless maneuvers.