Final answer:
Both the assertion that natality rate increases the population size and population density and the reason that natality increases the number of individuals through births are true. However, the reason does not fully explain the notion of population density and its other influencing factors.
Step-by-step explanation:
The natality rate is a crucial factor in understanding population dynamics in biology. When analyzing the statement provided, the Assertion which states that natality rate increases the population size and population density is true. This is due to the simple fact that an increase in the number of births within a population leads to a larger number of individuals, thereby elevating both the size and the density of the population.
The Reason provided explains that natality increases the number of individuals in an area through births, which is also true. While the reason is technically accurate, it does not fully account for population density, which is also influenced by factors such as the area available for the population, thus the assertion's explanation is somewhat limited.
Therefore, the correct answer to the question would be:
- B. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
Population growth is a multifaceted concept that can be affected by various factors. For instance, a large population size might contribute to higher birth rates due to more individuals capable of reproduction. On the other hand, high population density or a clumped dispersion pattern can also elevate birth rates because of increased encounters between potential mates. Other demographic characteristics such as sex ratio and life expectancy also significantly influence these dynamics.