Whether the External Temperature Is Hot or Cold,birds Maintain an Internal

question 13

Multiple Choice

Whether the external temperature is hot or cold,birds maintain an internal body temperature of approximately 40 ^$\circ$ C.This is an example of

• A)metabolism.
• B)cellular respiration.
• C)growth and development.
• D)homeostasis.
• E)proteomics.

---

Definitions:

Net Income

The amount of profit left after all operating expenses, taxes, and interest are deducted from total revenue.

Variable Cost

Expenses that are directly linked to the scale of production activity.

Fixed Cost

Costs that do not change with the level of output or sales in the short term, such as rent, salaries, and insurance.

Depreciation Expense

The portion of the total cost of a tangible asset that is charged as an expense in a reporting period, due to its reduction in useful life.