The salute is often thought to date back to Roman times, but there is no evidence that soldiers raised their hand as a formal greeting. Another theory is that it originated in medieval Europe, when knights used their hands to raise their visors, revealing their identity to demonstrate they were friendly.
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Answer:
studies his own
Explanation:
noun
the state or condition of being preoccupied or engrossed with something.
because humans count on coral reefs and the sealife they support,coral reefs should be able to count on humans too.
