Answer:
d. microbiome
Step-by-step explanation:
The microbiome refers to the combined group of microorganisms, including bacteria, fungi, viruses, and other microbes, that live in a specific environment, such as the human body or a particular ecosystem. The microbiome can have significant impacts on the health and functioning of the host organism or ecosystem and plays important roles in processes such as digestion, immune system function, and nutrient cycling.