Question

which of the following is the best evidence that continents were once in vastly different positions than they are today?
a penguins are found only in the southern hemisphere.
b fossils of tropical plants are found in antarctica.
c volcanoes encircle the pacific ocean.
d major rivers form deltas from continental erosion.

Explanation:

Tropical plants only grow in warm, low-latitude climates. Finding their fossils in the Arctic (a cold, high-latitude region) indicates the Arctic was once located in a warmer area, meaning continents have moved to their current positions. The other options do not support continental drift: penguins' limited range could be due to adaptation, volcanoes around the Pacific relate to plate boundaries (not past continent positions), and river deltas are a result of erosion and deposition unrelated to continental movement.

Answer:

B. Fossils of tropical plants are found in Arctic regions.