1. Grains have nourished humans since early times.<br>2. Just 600 human generations have passed since the end of the last Ice Age.<br>3. The blood that has passed through the tissues flows along veins to the heart.<br>4. Genetics has discovered thousands of mutations responsible for diseases in humans.<br>5. The hormones have become agents of great importance in radio-therapeutic techniques.<br>6. There have been plenty of studies on the subject, but none has been conclusive.<br> 7. Every living thing - a dolphin, an ant, a daisy, or a human body - has begun life as a single cell with a few molecules of DNA. (deoxyribonucleic acid; deoxyribonucleic acid)<br>8. Drugs have extended our lives and improved the quality of life in countless ways.<br>9. The last 60 years have witnessed remarkable achievements in cardiovascular medicine and surgery.<br>10. Anatomy has been a subject of great interest since ancient times.<br>11. There has been no significant change in human DNA in the last ten thousand years.<br>12. The outlook for patients with hypertension has improved markedly in recent years with the development of antihypertensive drugs.<br>13. The concentration of carbon dioxide in the atmosphere has mounted significantly over the past century or so.<br>14. Over sixty years researchers have observed an increase in association between sun exposure and cancer mortality.<br>15. Over the past 30 years, scientists have identified various proteins that activate or silence genes.<br>16. Radical improvements in the care of people under general anesthesia have laid the foundation for procedures such as organ transplantation and open-heart surgery.<br>17. In recent years, there have been all sorts of advances in everything from molecular biology to neuroscience, psychology, anthropology, sociology.<br>18. Development of techniques of cell, tissue and organ culture and electron microscopy has greatly expanded the range of methods available for the study of endocrine mechanisms and has added much to the knowledge of them.
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