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QuestionBiology

Which phrase best defines evolution by natural selection?
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Answer

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Step 1:
I'll solve this problem by breaking down the key components of evolution by natural selection.

Step 2:
: Understanding Natural Selection

Natural selection is a fundamental mechanism of evolutionary change proposed by Charles Darwin. It describes how organisms with favorable traits are more likely to survive and reproduce in their specific environment.

Step 3:
: Key Components of Natural Selection

The phrase that best defines evolution by natural selection includes several critical elements: - Variation within a population - Inheritance of traits - Differential reproductive success - Adaptation to environmental conditions

Step 4:
: Precise Definition

The most comprehensive definition is: "Individuals with heritable traits that are better suited to their environment tend to survive and produce more offspring, thereby gradually changing the genetic composition of a population over generations."

Step 5:
: Breaking Down the Definition

- "Heritable traits" means genetic characteristics can be passed from parents to offspring - "Better suited to their environment" indicates that some traits provide survival advantages - "Survive and produce more offspring" means these advantageous traits become more common in subsequent generations

Final Answer

This definition captures the essence of Darwin's groundbreaking theory of evolution by natural selection.