There are two components to the definition of diarrhea: Frequency â It is normal for an infant to have stools up to 10 times a day, although most donât attain this goal. The frequency will slow down as baby gets older, but even some toddlers and preschoolers still go several times a day.
plants quality concentrations growth. Indicator species are plants and animals that, by their presence, abundance, lack of abundance, or chemical composition, demonstrate some distinctive aspect of the character or quality of an environment.
A keystone species is one that other lifeforms in an ecosystem  depend on. Mosquitoes are a keystone species because they are  extremely low on the food chain, and if they w â¦ ere removed from an  ecosystem, the food supply would be interrupted.hey are critical factors in ecological processes such as â¦ energy flow and nutrient cycling.If we can identify a keystone species and quantify its impact on its community then we can usually understand how the community functions as a whole.