During the past 100 years, the major causes of death have shifted from INFECTIOUS DISEASES to CHRONIC DISEASES. About a century ago, most diseases were usually acquired by people as a result of infection, that is, the causative organisms are usually passed from one person to another. But since the advent of microbiology in medicine, the trend has change, because the microbes can now be countered using different antibiotic means.
<span>The refrigerator not only revolutionized the food distribution industry and improved people's diet, but is gas escapes from the refrigeration unit the Earth's atmosphere is adversely affected.</span>
<span>All multicellular organisms benefit from the organization of cells into tissues, organs, and organ systems. Cells form tissues which form organs which form organ systems which work together to make up an organism.</span>
Amoeba cells catch food and move about extending fingerlike projections of a colorless material called protoplasm and are found in decaying bottom vegetation of fresh water streams and ponds