This chapter investigates major biological principles in ecology, agricultural science, and public health, focusing on their ethical, environmental, and societal consequences. The first portion looks at biodiversity and biodiversity loss, emphasizing the ongoing conflict between economic growth against environmental protection. It explores biodiversity’s ecological, economic, and cultural value, as well as the issues of balancing sustainability and economic growth. The second half discusses agricultural science, including animal production, fish farming, industrial fishing, and developing food technology such as lab-grown meat and vertical farming. This section assesses the environmental impact of food production and the ethical considerations surrounding equitable food distribution. The last section digs into public health challenges, including advances in medicine and biotechnology such as the COVID-19 vaccine, in vitro fertilization, pharmacogenomics, and the ethical quandaries presented by artificial intelligence in healthcare. The chapter offers a balanced discussion of scientific advancement, sustainability difficulties, and ethical considerations, urging a critical outlook on biology’s future and position in society.