A group goes vertically and a period goes horizontally.
(a group goes down and a period goes across)
Koalas are not crusty, but their fur is very coarse, like wool.
Hope this helps.
This is called a climax community.
Over here a lead weight moved from sea level to the top of a mountain high and a sample of chlorine gas compression the density increases for the substances.
Good luck
Regards
BLACKSHARK