The type of operations used for transforming plaintext to cipher text, the number of keys used, and the way in which the plaintext is processed.
Answer: D) the central and peripheral nervous systems
hope this helps
its nitrogen i took the testttttttttttttttttttttttttttttttttt
excretory system: removes waste from blood.
respiratory system: obtains oxygen so the energy in the nutrients can be extracted.
circulatory system: transports nutrients from small intestine to the othet tissues.
nervous system: regulates and controls digestive functioning.
( Am not completly sure, but i think this is the answer)
