Ecological niches of species are variable in space and in time. Often in a biocenosis, the same species at different periods of development can occupy different ecological niches. So, the tadpole eats plant food, and the adult frog is a typical carnivore, and they are characterized by various ecological niches and specific trophic levels. Migratory birds are also characterized by different ecological niches in winter and summer due to migrations. In insectivorous birds, winter ecological niches differ from summer ones. Different ecological niches include gadfly larvae parasitizing on large mammals, and their adult individuals, which do not take food at all, or some butterflies, which have extremely active caterpillars that devour leaves, needles, and adults consume nectar or do not eat at all. The same is true for May beetle: an adult insect belongs to the ecological niche of leaf beetles, and the larva is a root eater. Among the algae, there are species that function either as autotrophs or as heterotrophs, thereby occupying certain ecological niches at certain periods of life.
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