The life of early humans was nomadic. why?

Early humans lead a nomadic life as they moved from place to place in search of food and water. They did this because the animals on which they were dependent for food moved to distant places.

bacteria – a word that often brings out a sense of uneasiness in most of us are, in fact, one of the earliest forms of life. it can be quite unnerving to know that there are bacteria all over your skin, hair, and even inside the body. but only a few species of bacteria are dangerous. the majority of bacteria are good, and without them, life on earth wouldn’t be possible. let’s learn more about how are bacteria essential for you to survive.

they produces sugar..

hope this , question was a little open ended