Pleas ( :

compare the emergence of advanced civilizations in meso and south america with the four early river valley civilizations.

the calendars produced by both the mayan and ancient mesopotamian civilizations

a) were both accurate

b) are still used today

c) were based on the moon's cycles

d) never worked correctly

It's C!  :D

"Were based on the moon's cycles"

greenland

c tundra

iceland is grassland

answer: researching and understanding issues being considered by lawmakers.

explanation:

lobbying is the act of attempting to influence a politician's behaviour. lobbyists can be members of a constituency, organizations, businesses, non-profit organizations or professional lobbyists.