C. Observations and measurements
Answer:
d
Explanation:
the dendrites is a part of the neuron receives messages from other neurons. Dendrites extend out from the cell body and receive messages from other nerve cells
If the resistor is in series with the rest of the circuit then a is the correct answer. The voltage across the resistor in series with another resistor is

where R is the big resistor and r is the small one and V is the total voltage drop across both. This is called a voltage divider
When you square the "year" of each planet and divide it by the cube of its distance, or axis from the sun, the number would be the same for all the planets