There are multiple reasons. 1) there are similar fossils found on different continents. 2) the continents shapes show that they could easily fit together. 3) there are similar rocks, minerals,and land forms on different continents. 4) there's evidence that there was once lush vegetation in areas with extreme cold.
An allele. It’s a variant of a cell.
The nutrients in some soils could be toxic to microorganisms/fish in those ponds or lakes.
