Answer: B
Explanation: And why are you searching up the answers if thats a MapTest -_-
...are originally a result of eukaryotes evolving from prokaryotic ancestors and met a very important increase of complexity.
The pair of elements which would likely have similar valency and similar chemical behavior is BORON AND ALUMINIUM.
Both boron and aluminium have three electrons in their outermost shells. The possession of the same amount of electrons in their valence shells will make the elements to behave in the same manner chemically in term of bond formation and chemical reactions.
Answer:
the 3rd. please follow Me......