Answer :
Some species that tend to reproduce later in life and have a small number of offspring with long lifespans are vulnerable to extinction.
K-Selected reproduction is best characterized by species that have a tendency to reproduce later in life, have a small number of offspring, expend a lot of energy caring for their young, and have extended life spans. Ecologists frequently categorize species as either r-selected species or K-selected species, which is one of the most popular ways to do so.
R-selected species have a large number of young and give each one little attention. According to the life history theory underlying r-selected species, there is a greater likelihood that at least some of the children will grow up.
In contrast, K-selected species invest a lot of time and effort in raising a few young. K-selected species make such a significant investment on the belief that caring for a limited number of young well greatly increases their chances of surviving. It has been demonstrated that both r- and K-selected techniques work well.
The r/K selection hypothesis in ecology deals with the choice of features in an organism that trade off quantity and quality of progeny. Wide variations exist, seemingly to support success in specific environments, between the focus on either an increased quantity of offspring at the expense of individual parental investment of r-strategists or on fewer children with a correspondingly higher parental K-strategist investment. Sometimes the terms "cheap" or "expensive" are used to describe the ideas of quantity or quality of progeny, as a dig at the children's disposable nature and parental sacrifice.
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