Some features might be feathers, thin bones, they are lighter to make flying easier.
Answer:
The statistical study of populations and how they change over time is called demography. Two important measures of a population are population size, the number of individuals, and population density, the number of individuals per unit area or volume.
Explanation:
The correct answer among the choices presented above is option D. The uterus is a pear-shaped muscular organ that houses the developing fetus. It is the organ located in the lower body of a female mammal. It is a major reproductive organ of most mammals.
