Select two central ideas of the passage.
A Jacques Cousteau promoted the conservation of our oceans.
B Over the centuries, many people have invented devices similar to the Aqua-Lung to
assist divers.
C The Aqua-Lung differs from Le Prieur's SCUBA in one important way.
D The Aqua-Lung allowed longer, safer dives.
E Cousteau and Gagnan might not deserve all the credit for inventing the Aqua-Lung.
Aqua-Lung is still a brand of equipment sold today.
G Cousteau and Gagnan built upon previous technologies when creating their Aqua-Lung.