Use microscopes to study the structure of DNA strands. Note how the different strands of DNA composition affect characteristics such as hair color and eye color. Investigate what traits are carried on strands of DNA and passed from parent to a child. This can help you understand what interests and habits are learned through environmental stimuli, and which ones are influenced by the DNA passed within a family.
Study the cell composition of animals that are similar to each other in the wild. Use a microscope to determine if the cells are similar to other animals that share their habitat or social patterns. Compare and contrast the cell structure of animals that prey on each other. Repeat the steps, comparing and contrasting the predators with animals they tend to bond with in nature.
Collect genetic samples from a variety of generations from the past 300 to 500 years. This research would involve contacting museums and biologists to help provide the supplies. Divide these into generations, and look for differences in their genetics that may have affected lifespan, risk for specific diseases, and other physical characteristics. Analyze the diets of those that lived during each generation, and determine how that may have played a role in their overall health and lifespan. The experiment can be conducted to compare changes over time in humans or animals.
Conduct research to learn if there is an average body temperature. Is 98.6 degrees Fahrenheit an accurate gauge of a normal body temperature? If not, what factors contribute to the change in body temperature. Determine how activities such as exercise, diet, health, and age might result in your body temperature changing throughout your lifetime. Study groups of volunteers, noting characteristics such as heritage and weight along with other health factors when recording body temperature.