AICE Marine Science Paper 2 Practice Exam 2025 – All-in-One Study Guide for Exam Success!

The number of individuals in a population is heavily influenced by the specific area they inhabit. This area encapsulates various environmental factors, such as availability of resources (food, shelter, and mates), habitat conditions (such as temperature and moisture), and spatial constraints that can either facilitate or limit population growth. Therefore, the characteristics of the environment in which the species resides play a pivotal role in determining population size.

For instance, a larger area with abundant resources may support a greater number of individuals compared to a smaller area that is less resource-rich. Additionally, this specific area can also impact breeding success and survival rates, further influencing population dynamics. The habitat shapes the interactions between individuals and their environment, which ultimately contributes to the number of individuals that can thrive within a given space.

In contrast, the size of their habitat and the historical abundance of the species can be related to population size but do not directly determine current population numbers. Similarly, the average reproduction rate is a key factor in population growth, but without considering the specific area and the conditions present, one cannot accurately conclude the actual number of individuals in that population.