Final answer:
Competition in biological ecosystems increases as the number of individuals rises and the availability of resources decreases, which is correctly reflected in Option C (Rises, Grows).
Step-by-step explanation:
In studying population dynamics and resource availability in biological ecosystems, the principle that completion becomes more important as the number of individuals rises or the availability of resources decreases, is a key concept. This is an example of the responses that organisms have to changes in population density and environmental resources, which is central to the study of ecology.
The scenarios presented in the given options reflect various conditions that populations may face. Option A (Grows, Expands) and Option B (Declines, Increases) suggest a balance where the number of individuals and resources move in opposite directions, which may not always result in heightened competition. It is Option C (Rises, Grows) and Option D (Declines, Shrinks) that are more directly concerned with the conditions under which competition might intensify. However, the correct option in the final answer should reflect an increase in population coinciding with a decrease in resources, leading to greater competition.
Option D is incorrect since both population and resources are declining. From the given information, it is clear that as human populations grow, resource availability may not keep pace, leading to increased competition. This falls in line with the idea that resource scarcity, and other factors such as pollution and climate change, limit growth. This understanding is essential for appreciating the real-world impact of exponential growth and how it can lead to a logistic growth pattern where the increasing population is checked by the limited availability of resources. Thus, the correct option is C. Rises, Grows, which reflects that competition becomes more important as population increases and resource availability diminishes.