An estuary is where salt water and fresh water meet. Estuaries are usually found at the edge of the coast, where the ocean water, or salty water, meets river, lake, any fresh water source, water.
A tributary is something completely different. It is a, usually smaller than the main river or lake, river/stream stemming off a bigger river or lake, or flowing into that river or lake.
Answer:
Local temperatures over one week tell us more about weather than climate
I suppose your question is which of these countries have a coastline?
Andorra - no
Austria - no
Germany - yes
Greece - yes
Portugal - yes
Sweden - yes
Switzerland - no
The Netherlands - yes
I would say D.
because you can’t count on foraging to feed 100 people, whereas agricultural growing of food is more effective when you have more people. you can plant 100 seeds, but you can’t guarantee to find 100 berries while foraging. hope this helps!
Vienna, Austria is the answer.