Answer: The nervous system allows organisms to sense, organize, and react to information in the environment. The basic unit of the nervous system is the neuron. Synapses form between the neurons, allowing them to communicate to other neurons or other systems in the body.
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A great amount of Antarctic animals feed on them. Whales, penguins, fish, birds, etc. They eat phytoplankton.
The range of temperatures in which an insect is able to live and reproduce is one element of that organism's niche, a description of its ecological requirements.