Currently, astronomers are observing the universe across many different regions of the electromagnetic spectrum, from gamma rays to radio waves. one of the primary issues when considering communication with potential life outside our planet is how an extraterrestrial signal would be distinguished from natural radiation sources. sort the following source properties by whether they might be considered as originating from intelligence or simply be natural phenomena.

answer: option c. i.e. electric current flowing “downhill” from the negative electrode to the positive electrode in a battery

explanation:

the water analogy to the circuits define the pipes (water flows) to the electric current. now, we know that the electric current flows from the positive terminal to the circuit (as shown in the diagram attached).

hence, option c is the correct answer.

i think the answer is a and b

i wish you luck

i really dont know but i will try okay.

so i think u would just add all them up and get your answer..