Final answer:
Bernice is interested in studying how the energy needs of the human body change through the lifespan. This topic falls under the subject of Biology as it involves understanding the energy requirements of living organisms.
Step-by-step explanation:
Bernice is interested in studying how the energy needs of the human body change through the lifespan. This topic falls under the subject of Biology as it involves understanding the energy requirements of living organisms. Understanding how the amounts of energy and biomass change from lower to higher trophic levels, and how matter cycles through ecosystems, is crucial in studying the energy needs of the human body. Additionally, demography, which is the study of human populations and their characteristics, including age groups, is also relevant to studying the energy needs of the human body.