<span>The immediate cause of its fall was pressure by the Ottoman Turks. The Ottomans had been fighting
the Byzantines for over 100 years by this time. In 1454, Constantinople
finally fell to them and their conquest of the Byzantine Empire was
complete.</span>
Answer:
D. Oxygen
Explanation:
Food molecules are broken down by reacting with oxygen. Just like burning the candle in oxygen. Cells also carry out reactions that join together monomers such as amino acids, sugars, nucleotides, etc., to form long polymer chains.
