Neurotransmitters can affect postsynaptic cells by causing molecular changes in the cells.
The term "chemical messengers of the body" is frequently used to describe neurotransmitters. The nervous system uses these molecules to send information between neurons or from neurons to muscles. A neurotransmitter influences a neuron in one of three ways: excitatory, inhibitory or modulatory.
When a stimulus is potent enough, the chemical messenger neurotransmitter is transferred into the nerve impulse. If it is powerful enough, it will reach the postsynaptic cell and affect the structure of the neuron. And when signal transduction happens, everything mentioned above is completed.
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The answer maybe B)Both descended from a common ancestor.
Reason: Since the cow and frog has similar bone structures, they probably had a common ancestor that used these structures to survive. For example, the common ancestor probably had hands or feet and used them to fight, gather food, walk, etc. Overtime, the common ancestor's offspring may have evolved in to new species who use these bone structures to evolve into feet, hands, or even fins.
They evolved in to these new things to better suit there environment just like how a deep sea fish may glow to help them see or how a zebra's skin is striped to fool predators that can't see well. These changes help organism adapt o their environment.
(I hope this helps)
Surface tension<span> is the property of the surface of a liquid which allows it to resist an external force. It is due to the cohesive nature (stickiness and clumpability) of the water molecules. </span>Since water has a strong surface tension:
<span>1) </span>The surface tension of water provides the necessary wall tension for the formation of bubbles with water
<span>2) </span>It is responsible for the shape of liquid droplets, too
<span>3) </span>Small objects will "float" on the surface of a fluid, as long as the object cannot break through and separate the top layer of water molecules
If surface tension is weak, the reverse happens. Bubbles will come from round to spherical, small objects will not float, w<span>ater will fall as it is, without forming spherical droplets and will not immediately spread. </span>