What would happen if only one aspect of a food web or matter cycle was negatively impacted?

What happens if one part of the food web disappears?

If one species in the food web ceases to exist, one or more members in the rest of the chain could cease to exist too. A plant or animal doesn't even have to become extinct to affect one of its predators. ... The U.S. Geological Survey notes that this decline probably caused the fish to go extinct.

Explanation:

Why is a food web important?

Food web is an important conceptual tool for illustrating the feeding relationships among species within a community, revealing species interactions and community structure, and understanding the dynamics of energy transfer in an ecosystem.  

What would happen if the plants from a food web were destroyed?

The simplest possible answer would be to say that the entire food web would collapse, and all of the organisms in the web would die of starvation. ... That's because the plant life supplies the initial energy into the food web system. No plants means no food for herbivores. No herbivores means no carnivores.

The economic system will be messed up and production level could get out of hand or lower

Explanation:

the second type of galaxy is called a barred spiral, which has a thing called a bar straddling the nucleus