Final answer:
Biological anthropologists study early human diets by analyzing dental microwear and isotopic analysis of teeth.
Step-by-step explanation:
Biological anthropologists can study early human diets by examining the teeth and bones of long-dead humans. The types of plants that were eaten can be determined by analyzing the dental microwear and isotopic composition of the teeth. Dental microwear refers to the microscopic scratches and pits on the surface of the teeth, which can indicate the type of food that was consumed. Isotopic analysis involves measuring the isotopes of elements, such as carbon and nitrogen, in the teeth, which can provide information about the types of plants consumed.