Typhoid fever is caused by bacteria in contaminated food or drink. in 1903, an outbreak of typhoid fever in ithaca, new york, killed almost 80 people. in addition, more than 1,000 ithaca residents became sick with the disease. the population shares the public water source. which type of limiting factor was involved in the typhoid outbreak that occurred in ithaca? . -population dependent factor. -population independent factor. density dependent factor. -density independent factor

Density dependent factor.

Explanation:

Density dependent factor may be defined as the factors that affects the size of population vary with population density. Various density dependent factors are food, water, disease and migration.

The outbreak of typhoid fever killed 80 people and 1000 people became sick with the disease. Density dependent factor is involved in the typhoid outbreak as the typhoid fever reduces the population size and disease is included in the density dependent factors.

Thus, the correct answer is option (3).

Density dependent factor

Explanation:

The limiting factor of a population are factors that reduce the population size or work to keep the population size around a particular figure.

While some limiting factors exert their effects based on the number of individuals per unit area in a population (density-dependent), others work the same irrespective of the population density.

For example, food shortage as a result of bad harvest may cause hunger and death, leading to a decrease in population size. This will definitely depend on the number of people occupying such a area. On the other hand, that an earthquake will happen is not a factor of the population size of an area. Even if everyone in the area migrate to another area, the earthquake will still happen. It is density independent.

Typhoid being a transmissible disease will easily spread in an area with large population density compared to an area with low population density because of more human-human interaction in densely populated areas.

Hence, typhoid outbreak is a population dependent limiting factor.

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