Which survivorship curve shows a constant mortality rate throughout an organism's life?

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Study for the Dual Enrollment Environmental Science Test. Prepare with flashcards and multiple choice questions, complete with hints and detailed explanations. Get ready for your exam!

Multiple Choice

Which survivorship curve shows a constant mortality rate throughout an organism's life?

Explanation:
A constant mortality rate across life means the chance of dying is the same at any age. On a survivorship curve, this shows up as a steady, uniform rate of decline in survival with increasing age, which is characteristic of a Type II curve. Type II reflects organisms where young, middle, and old individuals all face roughly the same risk of death each year. This differs from Type I, where most survive to old age and mortality drops off in youth and then rises late, and Type III, where there is very high mortality early in life and those that survive tend to live longer.

A constant mortality rate across life means the chance of dying is the same at any age. On a survivorship curve, this shows up as a steady, uniform rate of decline in survival with increasing age, which is characteristic of a Type II curve.

Type II reflects organisms where young, middle, and old individuals all face roughly the same risk of death each year. This differs from Type I, where most survive to old age and mortality drops off in youth and then rises late, and Type III, where there is very high mortality early in life and those that survive tend to live longer.

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