Early Middle Ages

Weapons were used in hunting, in fights and at war. Many items can be used as a weapon in an impulse but I think you mean tools, specifically made to go hunt, hurt or kill or to threaten with in fighting sports or tournaments...

There are different ways. Actually, the best fridges are either streaming water or a hole in the ground. Rich people would have ice cellars where they would store ice in winter time, which would remain good until Summer.

In both eras, many colours were in use. Clothes were dyed, but houses as well and you name what more. The most difficult to get colours (dark ones) were also the most expensive ones...

This question goes for prehistory and the Middle Ages as well. From the emergence of modern man (the homo sapiens sapiens, following the homo sapiens neanderthalensis) we are sure people used spoken language...

King Arthur is a myth. See for an extensive explanation: http://en.wikipedia.org/wiki/King_arthur

A possible answer is to be found at Nisbet:"as one of the points of calibration of Nisbet's vision on history, the transition between the Middle Ages and the Modern Era stands, in which both should be less seen as easy discernible...

It is not known exactly when human habitation began in the Cēsis area. The process of settlement began in the Mesolithic (7600–4500 BC) and continued in the Neolithic (4500–1500 BC). These people were still hunter-fishers...

The earliest people settled in the territory of Latvia when the last ice sheet had melted and the first simple flora and fauna had developed...

No, why should they! The modern human (Homo sapiens sapiens) is around for about 37,000 years. Ever since, people have the same appearance and the same development of the brain as we do...

Crannogs varied in size but it would probably be an extended family of parents, grand parents and children, aunts uncles, cousins, etc. Crannogs were used from 5,000 years ago to as recently as 250 years ago, so the number of people staying there would have changed as the function of crannogs changed.