Final answer:
The provided equation models Earth's population growth. Birthrates, mortality, and migration all influence the population size. As of the latest milestone, Earth's population was around 7 billion, but some countries have a negative growth rate.
Step-by-step explanation:
The equation provided, p(t) = 64/(1 + 11e^(-0.08t)), models Earth's population growth and is part of the broader topic of demographic studies within the field of Biology. Several statements are made in the question that relate to population dynamics, including the rate of growth, the role of births in population increases, and other factors that could influence these numbers, such as migration and mortality rates. The current population of the Earth, as given in one of the choices, is closest to around 7 billion as of the latest significant milestone reached between 2011 and 2012.
Factors Affecting Population Growth:
A. New births alone are not solely responsible for population increase; mortality rates and migration also play a critical role. B. Data on mortality rates, migration patterns, and age distributions would be necessary to fully understand the reasons for population increases.
Global Population Trends:
28. It is True that some countries have a negative growth rate. 29. As of the latest data referenced, the current population choice C, 'Around 7 billion,' is correct. Since then, the population may have grown subject to revision based on the latest statistics available post-2020.
As Earth's human population continues to grow at a significant rate, it's critical to understand not only the numbers but also the underlying factors contributing to this trend. While the rate of growth has moderated since the 1960s, it remains substantial. It's also noteworthy that this growth is not evenly distributed worldwide, with many economically developed regions having much lower growth rates compared to economically underdeveloped areas.