Enzymes in saliva kill some bacteria and protect the mouth from infection. When food reaches the stomach, much of it is sterilized by the hydrochloric acid in digestive juices. Further into the digestive tract, the friendly bacteria living in the intestines provide protection from invading bacteria
Answer:
Developing
Explanation:
A developing nation is the one which has lower income growth rate as compared to the growth rate of its population. Due to this reason, the population of developing nations is deprived of adequate resources. While in a developed nation, the level of income is high against the rate of population growth. Thus, every individual avails sufficient resources which are adequate enough for healthy living.
Arteries Larger, more muscular and more elastic, carry oxygenated blood from the heart, with the exception of the pulmonary artery. The blood has more pressure from the heart. Veins Under less pressure, so valves are needed. They are less strong than arteries and appear more floppy.
Arteries have thick, elastic, muscular walls whereas veins have thin walls with few elastic fibers. Arteries need these properties to give them the strength and elasticity needed to cope with the high pressure surges of oxygenated blood coming from the heart. Veins carry blood back to your heart from the rest of your body. The pressure of the blood returning to the heart is very low, so the walls of veins are much thinner than arteries.
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