4. How was Cousteau's invention used during World War II? Pls reply in a complete sentence

Undersea explorer Jacques Cousteau co-invented the Aqua-Lung, a breathing device for scuba-diving, in 1943. In 1945, he started the French Navy's undersea research group.

Explanation:

I wont lie and say that I got this from goo—gle, if you want me to make my answer please tell me. ill explain it more if needed.

2018 means 2018 ce or common era

there have been other eras too including bce, which included way more years.

basic principles: federalism, separation of powers, checks and balances, judicial review, representative democracy, limited government, rule of law, individual rights and responsibilities, consent of the governed, majority rule, popular sovereignty, equal protection.