Whay dont the present shapes of the continents fit perfectly into a supercontinent

Because of weather conditions, the shape of the continents changes some over time. Ex: volcanoes, hurricanes, tornadoes, earthquakes, etc.

The name of the instrument that the scientist uses is called a microscope.a microscope is used to view objects which is not visible to the naked eyes

Leaves specifically the gas exchange between plants and the environment. while plants undergo photosynthesis, they also partake in cellular respiration. respiration is the process that happens in the leaves of plants.