Question

question 3 of 10
which of these led charles darwin to develop his ideas about descent with modification?
a. mapping the distance between two galápagos islands
b. comparing the traits of galápagos finches with those of south american mainland finches
c. isolating genetic differences between finch species found on several galápagos islands
d. experiencing an earthquake in south america

Explanation:

Darwin observed that Galápagos finches had traits adapted to their specific environments. By comparing them to mainland finches, he saw how species could change (descent with modification) over time. This comparison was a key part of his thinking. Genetic isolation (C) wasn't something he could do as genetics was not well - understood then. Mapping distances (A) and experiencing an earthquake (D) were not the main factors in forming his ideas about descent with modification.

Answer:

B. Comparing the traits of Galápagos finches with those of South American mainland finches