Answer:
The tennis ball is 8000 times larger than the neuron.
Step-by-step explanation:
Average neuron is about
meter in diameter .
A standard table tennis ball is 0.04 meter in diameter .
To tell about how many times as great is the diameter of a ball than a neuron, we will divide the tennis ball diameter by the neuron diameter.

We will move the 10^-6 in the numerator to positive 10^6

= 
= 
= 8000 times.
So, the tennis ball is 8000 times larger than the neuron.