Fill in the Blank QuestionFill in the blank question.Factors affecting changes in population size are summarized as BIDE, or Births + – Deaths – .

The blank in the question refers to the factor of immigration and emigration when discussing changes in population size. Therefore, the complete phrase summarizes as:

Factors affecting changes in population size are summarized as BIDE, or Births + Immigration – Deaths – Emigration.

Here's a breakdown of the components:

1. Births: This refers to the number of live births occurring in a population during a specific time period, contributing to population growth.
2. Immigration: This represents the influx of individuals moving into a particular area or population, leading to an increase in population size.
3. Deaths: This accounts for the number of individuals who die within the population during the same time frame, contributing to population decline.
4. Emigration: This refers to the movement of individuals out of a particular area, which decreases the size of the population.

In a simplified equation, the formula can be expressed as: $\text{Population Change} = \text{Births} + \text{Immigration} - \text{Deaths} - \text{Emigration}$

By understanding these factors, ecologists and demographers can better analyze changes in population dynamics and their implications for ecosystems and human societies.