imagine you had a bar of gold and decided to cut in half. you repeated this
process until eventually you could no longer cut the gold in half without
splitting a single atom of gold. this would prove that gold is a(n)
o a. mixture.
ob. element
ocompound
od. mixture or compound.

Asquirrel population lives in an area. over many years, a river in that area grows wider and stronger, eventually forming a canyon. the squirrel populations on the two sides of the canyon can no longer mate with each other and ultimately form distinct species. this is an example of