Recall that a period is horizontal, and a group is vertical.
So if cobalt is moving "down" a period, it would be most logical to say that it would be Ni, or nickel. It could also be Copper, Zinc, Gallium, and so on. Make sense?
Dichotomous Keys are used to find out what type of animal,plant,fungi,prokaryote,eukaryote,or bacteria an organism is. A branching diagram is used to find what domain,kingdom,phylum,class,order,family,genus,species an organism belongs in.
The answer is endocytosis
