Question

which of the following was a weakness of wegener’s proposal of continental drift when he first proposed the hypothesis? 2 points
an absence of fossil evidence
unsupported climatic evidence
unrelated continental features
a lack of proven mechanisms

Explanation:

Wegener's continental drift hypothesis had evidence like fossil (e.g., same fossils on different continents), climatic (e.g., glacial deposits), and continental feature (e.g., matching coastlines) support. The main weakness was he couldn't explain how continents moved—no proven mechanism (like plate tectonics, which came later). So "a lack of proven mechanisms" is correct. Other options are wrong: fossil/climatic evidence existed, and continental features were related (matching coasts).

Answer:

a. a lack of proven mechanisms