Read the following introductory paragraph, which is missing a hook: The Human Microbiome Project will identify and describe the microbes that live on and in healthy humans. Scientists hope to discover how changes in these microbe communities correlate with disease and environmental upsets. The project divides the body into "biomes." In ecology, biomes are geographic regions with distinct climate patterns, plants, and animals. Similarly, in the microbiome project, biomes are body regions with distinct physical and chemical conditions and unique bacterial communities. The first steps in HMP research are sampling various biomes, such as the skin, digestive tract, nose and mouth, and identifying and comparing their bacterial inhabitants. Which option below makes the most effective hook? The National Institutes of Health conducts research on public health and biology related to medicine. They often study the role of microbes in human illness. Scientists say that bacteria, viruses, yeasts, worms, and other microscopic creatures live on our skin. But they don't know exactly who, what, when, where, or why. Maybe the microbes make us sick. Maybe they make us healthy. Maybe they do both. Or neither. I'd like to know, wouldn't you? "Walk on, walk on With hope in your heart And you'll never walk alone You'll never walk alone" When Rodgers and Hammerstein wrote the song You'll Never Walk Alone, they meant the inspirational chorus in the spiritual sense. But the words are even truer in the physical sense: no human is ever alone. Each of us walks through life in