What will be needed to start or stop the flow of the electric current through his circuit? A- copper wire
B-batteries
C- an energy source
D- a switch

A copper wire

Explanation:Three items are needed to generate an electric current: a supply of free-flowing electric charges (electrons), some sort of push to pass the charges through the circuit, and a path to carry the charges. A copper wire is typically used to hold the charges.

d is the correct answer.

b is incorrect because it makes food by itself

c is incorrect because us humans don't know how to produce their own food using the sun like plants.

a is incorrect because consumers can depend on carnivores for eating food for consumers to eat the dead organism. same thing with omnivores.