Diploid sporophyte cells undergo meiosis to produce haploid spores.
after receiving a stimus, the sensory receptors send(s) signals to the appropriate area of the body.
the must be sensory neurons.
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the water is warmed up by the sun and then it evaporates into the atmosphere. the sunlight warms the water by its heat. water is then cooled down and condensation takes place. the water then finally returns back to the earth by the process of precipitation in the form of rain or ice.