Question

which german scientist first proposed the idea that continents may have once been joined together? alfred wegener charles darwin lord kelvin isaac newton

Explanation:

Alfred Wegener was a German scientist who proposed the theory of continental drift, suggesting that continents were once joined (as a supercontinent called Pangaea) and have since drifted apart. Charles Darwin is known for evolution by natural selection, Lord Kelvin for work in thermodynamics, and Isaac Newton for laws of motion/gravity. So the correct option is Alfred Wegener.

Answer:

A. Alfred Wegener