___________ is the study of changes in density and growth of population in relation to various parameters of population.

Explanation

The study of changes in density and growth of population in relation to various parameters of population is known as **Population Dynamics**.

Population dynamics involves examining how populations of organisms change over time and space, considering factors such as birth rates, death rates, immigration, and emigration. It looks at how these factors influence the density of a population, which refers to the number of individuals per unit area. Additionally, it assesses the resources available to a population and the competition among individuals within the same species or with other species.

In summary, the correct term to fill in the blank is **Population Dynamics**.

### Step-by-Step Solution:
1. Identify the key concept in the question: The study of changes in density and growth of populations.
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