Answer:
B) Scientists are learning about life in the sea and how it may improve life on land.
Explanation:
Scientists are learning about life in the sea and how it may improve life on land. ( The study of sea plants and sea animals may help us to learn new ways of finding food). Scientists are searching the ocean floor for oil and gas deposits to help keep our world running smoothly.
Consider the main idea to be a concise but all-encompassing summary. It covers everything mentioned in the paragraph in broad strokes but excludes the specifics. Those details will appear in later sentences or paragraphs, adding nuance and context to the main idea, which will rely on them to support its argument.
