On an Evolutionary Tree,any Group That Includes a Common Ancestor

question 1

Multiple Choice

On an evolutionary tree,any group that includes a common ancestor and all of its descendants is called monophyletic ("one-tribe") .Recall the current evolutionary tree for Bacteria,Archaea,and Eukarya.According to this tree,are all organisms alive today monophyletic?

• A)yes
• B)no

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Definitions:

Contribution Margin

The difference between sales revenue and variable costs, indicating how much contributes to covering fixed costs and generating profit.

Variable Expenses

Costs that change in proportion to the activity of a business, such as sales commissions or raw materials.

Net Operating Income

is the total profit of a company after operating expenses are subtracted from revenue but before deducting interest and taxes.

Break-Even Sales

The amount of sales revenue required to cover all fixed and variable costs, resulting in zero net income or loss.