Question

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?- density-independent factor- density-dependent factor- population-dependent factor- population-independent factor

Explanation:

Density-dependent factors are factors whose impact on a population changes with population density. In this case, the typhoid spread through a shared public water source, so the closer (more dense) the population is (and the more they interact with the shared water supply), the faster and more extensively the disease spreads. This matches the definition of a density-dependent limiting factor. The other terms are either incorrect (population-dependent/independent are not standard ecological terms for this context) or do not fit, as density-independent factors affect populations regardless of density (like natural disasters).

Answer:

density-dependent factor