How does the endurance of organisms to the action of environmental factors at different stages of ontogenesis change?

Many factors become limiting during the breeding season. The endurance limits for seeds, eggs, embryos, larvae are usually narrower than for adult plants and animals. For example, many crabs can enter rivers far upstream, but their larvae cannot develop in river water, and this puts a limit on the distribution of the species. The range of game birds is often determined by the influence of climate on eggs or chicks, and not on adults.

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