Practice question

A Type I curve shows high survival through juvenile and middle ages followed by steep mortality late in life. Iteroparity, repeated reproduction across several seasons, is often associated with this pattern because adults usually survive long enough to breed more than once. The association is not a definition: the curve records mortality by age, whereas iteroparity describes scheduling of reproduction. Survivorship and reproductive schedules are connected through allocation. An organism has finite energy for growth, maintenance, defense, and reproduction; investment in one function constrains the others. Natural selection does not pursue a universal ideal. It favors combinations that leave more surviving descendants under the mortality risks and resource patterns experienced by a population. A useful check is to ask what happens at the biological extremes and whether the proposed mechanism still makes sense. Interpreting the example at the appropriate population scale keeps the causal mechanism distinct from a simple correlation or an absolute rule.