Which natural phenomenon is the best example of periodic behavior?

a. the amount of pollution in los angeles as a function of time
b. the number of fish in a pond as a function of time
c. the closing value of the stock market at the end of each day
d. the number of hours of daylight each day

Option D is right.

Step-by-step explanation:

We have chosen option D because periodic behaviour means there will be oscillation between maximum and minimum and the range will be within two values.

A is wrong since amount of pollution in Los Angels is continuously increasing and hence not periodic

B. Fish in a pond may increase continuously not periodic.

C. Closing value of stock may fluctuate but no limits for max or minimum

Hence only option D is right.

answer: there are 453.592 grams in a pound.