As a young biologist, Charles Darwin had expected the living plants of temperate South America would resemble those of temperate Europe, but he was surprised to find that they more closely resembled the plants of tropical South America. The biological explanation for this observation is most properly associated with the field of:

Biogeography

Explanation:

Charles Darwin created a mechanism for evolution

Bio-geography is the study of how species are distributed , it helps to shows where the organisms live and why they are found in that habitat or the reason behind their absence from a certain area(geographical). This field of study show geographical distribution of organism and it provides information on the their evolution.

Charles Darwin makes used of the field by using the concept of bio-geography in relating the plants in temperate South America against the plants of tropical South America.

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