When JWilliam Schopf Observed Chains and Clumps That Resembled Modern Cyanobacteria

question 142

Multiple Choice

When J.William Schopf observed chains and clumps that resembled modern cyanobacteria in Australian sedimentary rocks, he concluded that these were remains of living organisms because

• A) the structures were near-perfect spheres, a form rarely found in nature.
• B) the structures had an equal ratio of l- and d-amino acid isomers.
• C) the structures had internal substructures that are characteristic of living systems.
• D) the structures were in sediments deposited far from water.
• E) the sediments indicated that oxygen had been consumed.

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Definitions:

Contribution Margin

The amount by which sales revenue exceeds variable costs, it's a key figure that helps in assessing the profitability of products or services.

Selling Price

The amount of money charged for a product or service, which can cover costs and provide profit for the seller.

Machine Hours

represent the total time that production equipment or machines are operated within a specific period, often used to allocate manufacturing overhead.

Contribution Margin

Contribution margin is the difference between sales revenue and variable costs, indicating how much revenue contributes towards covering fixed costs and generating profit.