The One Unique Feature That Separates Living Species of Birds

question 20

Short Answer

The one unique feature that separates living species of birds from other animals is ________.

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Definitions:

Theories

Systematic sets of ideas or principles that explain phenomena and are supported by evidence.

Researchers

Researchers are individuals who conduct detailed study and systematic investigation into a specific subject, topic, or area of interest with the goal of discovering or interpreting facts, revising theories, or applying new knowledge.

Application

The act of putting something to a particular use or purpose, such as a job application, or the utilization of a concept or theory in a practical situation.

Hypotheses

Proposed explanations or predictions that can be tested by observations or experiments.