The muscular and skeletal systems work together to allow movement. The ultimate guide to understanding biology Have you ever wondered how the food you eat becomes the energy your body needs to keep going? If there’s competition for survival and not all the organisms are the same, then the ones with the advantageous traits are more likely to survive. p>\n

Digestion involves the mechanical and chemical breakdown of food molecules into their smallest subunits.

Human beings are somewhat unique among living things in that we can make conscious choices about how many offspring we have. p>

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Microbes are essential to our everyday lives, from the food we eat to the very internal systems that keep us alive. Now scientists know that differences in organisms arise due to mutations in DNA combined with the mixing of genetic information during sexual reproduction. Digestion involves the mechanical and chemical breakdown of food molecules into their smallest subunits. Get a feel for biology with hands-on activities Biology Workbook For Dummies is a practical resource that provides you with activities to help you better understand concepts in biology. Here is a brief summary of key human biological concepts: