___________ Contribute More Than 40% of Earth's Primary Productivity

question 66

Multiple Choice

___________ contribute more than 40% of Earth's primary productivity.

• A) Bacteriophages
• B) Nitrogen-fixing bacteria
• C) Marine cyanobacteria
• D) Aquatic fungi

---

Definitions:

Contribution Margin

The amount of revenue remaining after deducting variable costs, used to cover fixed costs and generate profit.

Sales Mix

The relative proportion of different products or services sold by a company, significantly influencing its overall profitability.

Existing Sales

The volume or amount of sales that a company has already achieved within a specific period, prior to any new sales efforts or campaigns.

Contribution Margin

The amount remaining from sales revenue after variable costs have been deducted, indicating the portion of sales available to cover fixed costs and generate profit.