The Hypothesis That Birds Evolved from Dinosaurs Is Potentially Confusing

question 3

Multiple Choice

The hypothesis that birds evolved from dinosaurs is potentially confusing because dinosaurs-at least the ones thought to be the ancestors of birds-did not fly.Why do biologists still hold to this hypothesis despite this point?

• A)Feathers in dinosaurs are believed to have served as insulation.
• B)Dinosaurs may have used feathers to attract mates.
• C)Dinosaurs may have used feathers as an aggressive display to ward off enemies.
• D)All of the above are supporting evidence for this hypothesis.

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Definitions:

Government Expenditures

The total amount of money that a government spends on public services, infrastructure, defense, and welfare programs.

Business Cycle

The fluctuations in economic activity that an economy experiences over a period of time, characterized by periods of boom and recession.

Marginal Propensity

Marginal propensity, in economics, refers to the fraction of an increase in income that is spent on consumption. It represents the change in consumption resulting from a change in income.

Government Spending

This refers to the total expenditure by government agencies on goods, services, and public works.