When the genetic regulatory mechanism of a given cell is altered, so that the cell divides without limit, that is a cancer cell. Genetics can be altered by certain types of chemicals called carcinogens, or by certain types of viruses, or by radiation. Even the ordinary process of human biochemistry can sometimes go wrong, due to random error.
entire lifespan
Cancer can occur in the human body at any age.
Well, tuberculosis is one. Cancer is another.
It has probably been with people when people first became people. According to Google, the link between Radon gas and lung cancer was noticed in mines in 1470. But I don't think lung cancer 'first occurred' there. I think lung cancer has always been with human beings.
There are more than 200 kinds of cancers.
yes it has I even rats have had cancer
About 2 trillion cell divisions occur in an adult human every 24 hours.
movement occurs in human beings is when you use your legs and other body parts to walk
Nope!
Yes, human beings are real.
I have heard that plants and trees can develop cancer as they are made up of cells, just like human beings. I'm not completely certain but with research you could probably find out.
"Seres humanos" is the Spanish term for "human beings" or "human beings." It refers to individuals of the human species.