The Jews follow many laws. Most of them are written in their Bible, called the Torah. The most important laws are in the Ten Commandments, which the Jews believe were written by God. the Ten Commandments are the basic structures of Judaism.
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Orthodox Jews follow nearly all the laws. Conservative follow some, but not all. Reform Jews follow little or none of the laws.
Jews first and foremost follow the laws of the land.
By learning it and observing its laws.
The Torah only requires Jews to follow the law of the Torah. According to Judaism non-Jews are obligated to follow just the 7 Noachide laws which are described at http://www.answers.com/topic/seven-laws-of-noah
There's no exact number, but it's mostly Orthodox Jews who follow the dietary laws.
The kosher dietary laws were designed to preserve health standards, and it's mostly Orthodox Jews that follow these laws.
No, no more so than any other entire religious group adheres strictly to their own tenets. However, the Orthodox Jews do attempt to follow all the religious laws strictly, while other Jews observe the laws to varying degrees.
The Mosaic Laws are the laws that God gave to Moses. Jews are supposed to follow these laws to the best of their ability as a guide to being a good person and a good example to the people of the world. Jews who strictly follow the rules are simply religious Jews.
No, however not all Jews follow the Jewish dietary laws.
Liberal Jews have a variety of degrees to which they follow Kashrut. Some do so strictly. Some follow the laws at home, but not outside the home. Some follow laxer standards, but consistently everywhere. Some do not follow the rules at all. I depends entirely on the person.
Hasidim are a portion of Orthodox Jews. They follow Judaism on a strictly Orthodox level.
There were change in laws because nobody was doing as the law said so they changed the law to make the Jews in the Holocaust do without protest and the Jews would have to follow these rules so they would not get the punishments for example death