I think it is C, but I could be wrong because I am taking an educated guess.
Katie has a rare neurological disease in which her neurons can receive new information and process it, but some of them just cannot pass the information along. This disease most likely affects the axon of the neurons. Since axon is the signal transmitting end of the neuron, if the fusion of the vesicles containing the neurotransmitters with the cell membrane around the synaptic cleft is hampered, then the signal transmission gets disrupted.
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Explanation:
a bird feather is biotic because it was made on a living thing. fog is abiotic because its not living or was never living. i might be wrong about the feather tho.
Answer:
one way to increase the deposition is to decrease the amount of vegetation living near the stream. This then causes erosion of all the sediment near the stream.The stream then carries all the loose sediment.