Which of the Following Groups Had Made Their Appearance During

question 4

Multiple Choice

Which of the following groups had made their appearance during the Ordovician period?

• A)jawless and jawed fish
• B)jawed fish and amphibians
• C)amphibians and reptiles
• D)reptiles and mammals
• E)All of these groups had appeared by the Ordovician period.

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The amount of money gained or lost on each unit of a product sold, calculated as the difference between the selling price and the cost of production.

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