Answer:
Brain, spinal cord, and nerves.
Explanation:
While they work together, each is an individual system.
Answer:
b and c
Explanation:
otherwise you couldn't scratch your back with one hand or do certain yoga positions
Answer:Classification, in biology, the establishment of a system of categories on the basis of presumed relationships among organisms. The science of biological classification is commonly called taxonomy.
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R136a1 and our Sun both are made of the same compounds and molecular build, however R136a1 is 261 times bigger and the mass is approx. 261 times greater than our Sun's mass.