Acetylcholine. in CNS and PNS: generally excitatory but is inhibitory to some organs and glands; an organic, polyatomic ion that acts as a neurotransmitter in both the peripheral nervous system (PNS) and central nervous system (CNS) in many organisms including humans.
So Zone 3 is more typical of North Dakota, while Zone 9 is lovely Florida weather. Each hardiness zone differs by 10 degrees F, so the difference in low winter temperatures between zones 6 and 7 is 10 degrees; between zones 6 and 8, 20 degrees; between zones 6 and 9, 30 degrees, and so on.
also called tropical zone or torrid zone, all the land and water of the earth situated between the Tropic of Cancer Tropic of Cancer,parallel of latitude at 23Â°30' north of the equator; it is the northern boundary of the tropics.lso called tropical zone or torrid zone, all the land and water of the earth situated between the Tropic of Cancer Tropic of Cancer,parallel of latitude at 23Â°30' north of the equator; it is the northern boundary of the tropics.