evolution

What does the concept of "descent with modification" mean in the context of evolution?

• Organisms remain unchanged over time.

• Species change over generations, inheriting modifications from ancestors.

• Evolution occurs only when mutations happen.

• Organisms evolve only when exposed to environmental stress.

Which of the following provides the strongest evidence for common ancestry among species?

• Similar habitats

• Analogous structures

• Homologous structures

• Random mutations

How does natural selection contribute to changes in populations over time?

• It selects organisms that adapt better to their environment, allowing them to survive and reproduce.

• It forces all organisms to evolve new traits regardless of their environment.

• It ensures that all traits are passed down without variation.

• It eliminates genetic mutations from populations.

What role do mutations play in the process of evolution?

• They create genetic variation, which can lead to new traits.

• They always result in harmful changes to an organism.

• They stop evolution by keeping genetic information unchanged.

• They only occur in response to environmental changes.

Fossil evidence supports the theory of evolution by showing that:

• Species have remained unchanged for millions of years.

• Organisms in the past were identical to modern species.

• Organisms have gradually changed over time, revealing ancestral relationships.

• Fossils are found in random layers with no pattern.