Question

when can diseases, starvation, and overcrowding impact the human population the most? when the population is sparse, very spread out, and under carrying capacity; when the population is very close together and is over carrying capacity; population levels have no impact on the spread of disease, overcrowding, and starvation.

Explanation:

To determine when diseases, starvation, and overcrowding impact the human population the most, we analyze each option:

1. For the first option: A sparse, spread - out population under carrying capacity would have more resources (like food, space) per person. So, the likelihood of starvation (due to enough food), overcrowding (since people are spread out), and disease spread (less contact between individuals) is low. Thus, this option is incorrect.
2. For the second option: When a population is very close together (high population density) and over carrying capacity, resources such as food and space become scarce. The close proximity of individuals makes it easier for diseases to spread (more contact), the lack of food leads to starvation, and the high number of people in a limited space causes overcrowding. So, this situation maximizes the impact of these factors.
3. For the third option: Population levels clearly impact these factors. For example, in a densely populated area, diseases spread faster, and with more people, the demand for food increases, which can lead to starvation if resources are insufficient. So, this option is incorrect.

Answer:

B. when the population is very close together and is over carrying capacity