Decomposers and scavengers break down dead plants and animals. They also break down the waste (poop) of other organisms. Decomposers are very important for any ecosystem. If they weren't in the ecosystem, the plants would not get essential nutrients, and dead matter and waste would pile up.
The answer is C barriers around mating
Verbal communication skills include more than just talking, it encompasses both how you deliver messages and how you receive them. :)