Does decay always happen at the same rate in ecosystems?

False. Decay of dead plant and animal material is normally accomplished by yeast,  or bacteria

No it can depend on what kind of environment and also what you are studying that is decaying. Wood will decay a lot faster than other substances

Neurotransmitters are messengers responsible for communication between neurons. they are released from synaptic vesicles and are received by receptors.  the communication is referred to as neurotransmission. the following statement is true about neurotransmitters: a. they're stored in synaptic vesicles in the axon.