Biology Illinois Edition (Glencoe Science)
Biology Illinois Edition (Glencoe Science)
7th Edition
ISBN: 9780078759864
Author: Alton Biggs
Publisher: MCG
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Chapter 4, Problem 1A
Summary Introduction

To analyze:

The correct vocabulary to replace the underline words in the given sentence.

Introduction:

A population can be defined as a group of individuals of the same species living in the same geographic area. A population has certain attributes that an individual organism does not have such as birth rate, death rate and sex ratio.

Expert Solution & Answer
Check Mark

Answer to Problem 1A

Immigration.

Explanation of Solution

The density of population fluctuates due to following reasons;

Natality (B): It refers to the number of births in a given period that are added to initial density.

Mortality (D): It refers to the number of deaths that are deleted from the initial density.

Immigration (I): It refers to the number of individuals who have come into the habitat from somewhere else and added to the population.

Emigration (E): It refers to the number of individuals who left the population and migrated somewhere else

So, if N is the population density at time t, then population density at time t+1 can be shown as:

Nt+1 = Nt + ( B+I ) − ( D+E )

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