Traits may be determined by multiple genes.
The answer is the nasal cavity. It is a large air filled space above and behind the nose in the middle of the face, it is lined with hairs and mucus membrane. The function of the nasal cavity is to warm, moisturize, and filter air entering the body before it reaches the lungs.
The variety of organisms that occupy a given region including microscopic protists to large mammals. The region can be a political unit such as a country a geographic feature such as a mountain range or the entire world. The first level of bio diversity is genetic diversity. Next is taxonomic diversity. Also ecological diversity.
B. By using specific examples of inferences that could be made using two laws of stratigraphy