Explanation:
North America is a continent entirely within the Northern Hemisphere and almost all within the Western Hemisphere. In can also be described as a northern subcontinent of the Americas[5][6] in models that use fewer than seven continents. It is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the west and south by the Pacific Ocean, and to the southeast by South America and the Caribbean Sea.North America covers an area of about 24,709,000 square kilometers (9,540,000 square miles), about 16.5% of the earth's land area and about 4.8% of its total surface.
Answer:
Hormones are chemical messengers that are secreted directly into the blood, which carries them to organs and tissues of the body to exert their functions. There are many types of hormones that act on different aspects of bodily functions and processes.
It is unchanged and can be used again for the same chemical reaction.
is the answer
