It is called a nucleus. It's what determines what type of metal, gas, or whatever on the table.
This is the excretory system
I've checked all the options and I think that the right answer looks like this: Mollusks have highly developed olfactory receptors.
Organism in an eniornment can compte for food
Answer:
By action potential nerve contract the muscle
Explanation:
The muscle contract when the nervous system sends action potential to the muscle. So the nervous system delivers signal to muscle, the first signal reaches the neuromuscular junction. The signals are passed by a chemical messenger called neurotransmitter release by motor neurons, the chemicals bring reaction and shorten the muscle fibre. When neurotransmitter are absent or reduce in concentration the process reverse and muscle relax again.
