Answer :
An indicator insect is Sturnus vulgaris. The indicator animal is an organisms, usually a plant or a microbe, that acts as a gauge for the surrounding environment. Option 2 is Correct.
For instance, greasewood commonly denotes saline soil, whereas mosses frequently denote acidic soil. Water with tubifex worms is oxygen-poor, stagnant, and unsafe for drinking. Some creatures serve such a vital function in the ecosystem that their removal would trigger it to break down, despite the fact that indicator species can inform us approximately the health of the environment — or lack thereof.
These creatures are referred to as keystone species. The ecology they are a part of is maintained by native species. Some exotic species will displace native ones. We are informed of adverse alterations in the ecosystem through indicator species. Ecological roles are played by keystone species. Option 2 is Correct.
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Correct Question:
Sturnus vulgaris is:
1. a keystone species
2. an indicator species
3. a nonnative species.
4. Andropogon gerardii.
