In wegener's time, scientists thought that the occurrence of fossils of the same organism in two different, disconnected continents was proof that

continents were once together as super-continents called pangea

Explanation: Continents were once compressed into one single protocontinent called pangea before they were separated. So organisms that were once together died on seperate continents.

temperatures get warmer — and heatwaves are more common. nothing says summer like warm weather. this rise in temperatures is caused by the tilt of the earth's axis. our planet doesn't sit perfectly straight as it spins — it has a slight lean of approximately 23.5 degrees with respect to the sun, called the axial tilt.

explanation:

81 is a composite number.