Final answer:
A survivorship curve with uniform death rates over time is described by a type II survivorship curve. This indicates that the mortality rate is consistent throughout the species' lifespan, unlike type I or type III curves, which have varying mortality rates depending on the stage of life.
Step-by-step explanation:
A survivorship curve with uniform death rates over time is most likely to be a type II survivorship curve. To clarify, there are three main types of survivorship curves characterized by different patterns of mortality over the lifespan of an organism. Type I survivorship curves are observed in species where mortality is low for the younger and middle-aged individuals and high for older members of the population; an example would be humans. Type II curves represent a constant mortality rate throughout the life of the species; examples of this can be found in many bird species. Lastly, Type III curves signify species that have a high mortality rate during the early life stages, but those that survive these early stages are likely to live much longer; many trees and marine invertebrates display this kind of survivorship curve.