Надеюсь, что это правильно, я старалась)
Объяснение:
1. If any species in the food chain disappears, then there will be an imbalance in the entire ecosystem.
2. As soon as the environment of a species or a population will develop in an unfavorablt way. It will cause an ecological crisis.
3. If the ecologist does not make soil and water analyses, they will not be able to estimate еру environmental pollution.