Decomposers are a necessary part of a healthy ecosystem because they

recycle nutrients( amino acids, minerals, etc), from dead materials to the soil so they can be used again by the ecosystem.

image result for what happens whenever a net force acts on an object

if an object has a net force acting on it, it will accelerate. the object will speed up, slow down or change direction. an unbalanced force (net force) acting on an object changes its speed and/or direction of motion. an unbalanced force is an unopposed force that causes a change in motion.

feral cats are estimated to eat tens of millions of native animals each night in australia