You can only make one zygote but in some cases the egg splits and makes an identical twin.
A metal and non-metal form into a compound. that compound is an ionic compound.
the insertion of a nucleotide into DNA would most likely cause a mutation.
The location and types of volcanoes are related to plate tectonics as well, so in that sense volcanoes also help us to understand about the tectonic history of a region because if there are volcanoes someplace even if they're not currently active we know that that must have been some sort of a plate uwu
