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.
Answer:
Find the mass of a car that has a speed of 30 m/s and a momentum of 45,000 kg*m
Explanation:
Answer:
W = Animal
X = Bacteria
Y = Protist
Z = Plant
(may or may not be right btw)
It could be they want the answer that they could not adapt to the changing climate. they where wiped out just by an asteroid though
Answer:
It can be both but mainly Fresh water
