The various components of an arthropod's nervous system are:
A dorsal brain present at the head end
A bundle of nerves which helps in coordination of movements and sensory actions.
Ventral nerve cords are resent from the brain to the rear end.
Two cords are joined by parallel commissures.
They also have segmental ganglia, and subesophagal ganglia.
The percentage of the orignal uranium that remains after two half-lives is 25%
<h3>Data obtained from the question </h3>
- Original amount (N₀) = 100%
- Number of half lives (n) = 2
- Percentage remainig (N) =?
<h3>How to determine the percentage remaining</h3>
N = N₀ / 2ⁿ
N = 100 / 2²
N = 100 / 4
N = 25%
Thus 25% of the original sample remains
Learn more about half life:
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It would definitely be at 90%
I would say that would be DNA
Hope this helps :)
The nervous system communicates through electrical impulses and the communication is very fast. It works in a relay fashion, from point to point comparable to the way the old telephones systems used to work.
The endocrine system communicates by chemical signals via the bloodstream. Hormones are secreted into the blood and extra cellular fluids, then transported to target cells, which must bear a receptor to be able to bind to a specific hormone, and respond.
Hormones are chemical messengers secreted into blood or extracellular fluid that affect the function of other cells.
Endocrine communication is not quite as fast as the nervous system communication
