It Has Been Suggested That Cyanobacteria Are the Most Important

question 91

Multiple Choice

It has been suggested that cyanobacteria are the most important organisms to have evolved on the Earth. What evidence justifies this view?

• A)Some cyanobacteria can fix nitrogen (which plants need in order to produce oxygen), making them unique among bacteria.
• B)Some cyanobacteria differentiate to form multiple cell types, making them the ancestors of plants and animals.
• C)Cyanobacteria evolved the ability to use water as an electron donor in photosynthesis, generating the oxygen gas found in the atmosphere.
• D)Cyanobacteria form microbial mats, enabling them to spread across lake bottoms and shallow seafloors.

---

Definitions:

Activity-Based Costing

A financial methodology that calculates the cost of products and services by identifying activities related to production and assigning costs to each product accordingly.

Direct Labor-Hours

The total number of hours worked by employees directly involved in the manufacturing process.

Direct Materials Cost

The cost of raw materials that can be directly attributed to the production of a finished good.

Activity-Based Costing

A costing methodology that assigns overhead and indirect costs to specific products or activities based on their consumption of resources.